This book is a sweeping character-driven fantasy that threads an original family through the canon events of Yona of the Dawn. It follows Aren, Taeyul, and their adoptive son Rin as they survive betrayal, vanish into the shadows of port Awa, and quietly reshape the war for Kouka’s soul while refusing to let the past destroy the fragile happiness they build for themselves.
Across five chapters, the story explores the cost of loyalty and the ferocity of found family: how love can harden into vengeance, how trust can splinter and slowly mend, and how three people who were supposed to be footnotes in a kingdom’s history become one of its most decisive, unseen forces.
Chapter 1 introduces Aren as a sharp-tongued Sky Tribe palace clerk in Hiryuu Castle, admired and feared among staff for his beauty and unwavering backbone. He refuses to be treated as expendable, defending those beneath him with a fearless, cutting wit that hides a deeply protective heart. His fiancé Taeyul is a respected combat instructor, a gentle giant whose belief that strength exists to protect, not dominate, guides his every lesson. The two are engaged, their matching rings a quiet declaration of devotion amid palace politics. They are not alone: at twenty and eighteen, they took in an orphaned boy, Rin, and made him their son. Now seventeen, Rin has grown into a breathtakingly beautiful young man, as kind as Taeyul and as steady as Aren is fierce. Within the Sky Tribe’s routines, the three of them form a small universe: Taeyul teaching younger guards with encouragement instead of cruelty, Aren scolding insolent trainees and even chiding Taeyul for being too nice, Rin trailing after them with wide eyes and unshakable loyalty.
The opening chapter paints their everyday life in Hiryuu Castle, their quiet domestic intimacy, and the way Aren’s and Taeyul’s strengths interlock to cradle Rin. It also sows the first hints of storm: Soo won’s presence in the castle, Yona’s girlish crush on him, and the subtle tension between King Il’s pacifism and the murmurs of discontent around Yu Hon’s death. Aren’s role as a clerk places him near the heart of palace information, while Taeyul’s position as an instructor makes him familiar with both Hak and Soo won as students, creating emotional ties that will soon be brutally tested.
Chapter 2 shatters their fragile peace. Aren receives a letter in King Il’s name, summoning him to a secluded location. Taeyul insists on accompanying him, unwilling to send his fiancé into uncertainty alone, and Rin stubbornly tags along despite their misgivings. None of them realize the summons is a trap conceived by Soo won, who already knows that Aren and Taeyul’s loyalty lies firmly with King Il. When they arrive, they find no king waiting, only Soo won with elite Sky Tribe soldiers at his back. The ambush is swift and merciless.
Taeyul, who has always believed strength is for protection, suddenly fights with lethal focus. When a soldier raises a blade over Rin, Aren throws himself in front of their son, taking the slash to his own shoulder. Blood pours from the wound as Rin sobs, convinced he is about to lose the man he calls Father. Taeyul’s gentleness vanishes under a surge of fury. The quiet instructor the soldiers thought they knew becomes a storm, cutting down twenty of the thirty soldiers sent to erase his family. Shock ripples through Soo won’s men as they realize how badly they underestimated him. In a single, calculated strike, Taeyul carves a wound into Soo won’s shoulder exactly where Aren was cut, a wordless promise of retribution.
Hemmed in and outnumbered, Taeyul chooses a desperate escape. Clutching both Aren and Rin to his chest, he leaps from the cliff, locking eyes with Soo won as he falls and vowing to kill him the next time they meet. Soo won watches them vanish, shaken for the first time by the power and intent he has provoked. He realizes from the broken branches that the family likely survived, yet lets them go, haunted by the knowledge that Taeyul will one day return to fulfill his vow.
The fall does not kill them, but the river and rocks leave them battered and unconscious. Rin wakes first on a desolate shore, uninjured only because both his parents shielded him. He tries to wake Aren and Taeyul, but they lie bloodied and still. When Taeyul finally stirs and Aren groggily follows, the relief is short lived. Taeyul, himself suffering broken ribs and a slashed back, hoists Aren onto his own shoulders and takes Rin’s hand, stumbling toward any village that might mean safety. On the path, the trauma finally breaks Aren’s composure. Recognizing some of the soldiers from their own Sky Tribe and realizing just how deep the betrayal runs, he breaks down crying, unable to stop. The sound of his sobs devastates both Taeyul and Rin, who are not used to seeing their fierce cornerstone so frightened and fragile. As Aren’s tears reopen his wound and he grows paler, swaying and whispering a broken “sorry,” Rin panics, convinced his father is dying.
Chapter 3 becomes a story of survival, exile, and the slow reconstruction of trust in a new world. It begins with their rescue by Captain Gi gan, the hard eyed yet deeply maternal leader of the pirate crew in port Awa. Recognizing Taeyul’s skills as a fighter and Aren’s competence as a cook, she offers them shelter and work. For Taeyul, who is watching Aren flinch from strangers and hide behind him or Rin at any hint of danger, this offer is not just a chance at survival, it is an opportunity to disappear. He decides that for Rin and Aren to live without fear, the world must believe they died on that cliff. If Soo won learns they survived, he will hunt them again; Taeyul refuses to risk another day of Aren’s trembling tears. So he resolves to cut ties with the past, to let their old names fade and build a life from scratch among Gi gan’s loyal, rough-edged family.
In Awa, Aren is initially a shadow at Taeyul’s and Rin’s backs, equally wary of strangers and of his own tribe’s betrayal. He clings to their hands, finding safety in the feel of Taeyul’s larger fingers completely enveloping his own smaller ones, and in Rin’s warm, steady grip. Over time, that constant contact, simple and wordless, becomes both a comfort ritual and a symbol of their refusal to let the world pry them apart. Slowly, months of shared meals, quiet nights, and Gi gan’s gruff affection help Aren begin to reclaim his old self. His stubborn spine returns. He scolds rowdy pirates for reckless behavior, demands discipline in the galley, and wins their respect not through fragility but through the same unbending will that once made him famous in Hiryuu Castle. The crew learns that beneath his beauty lies a core of steel, and they come to treasure him as much as Taeyul and Rin do.
Parallel to their hidden life, the canon events of Yona’s story unfold above the waterline. On the very day of Soo won’s ambush, he continues on to Yona’s sixteenth birthday, where he murders King Il. Yona’s flight with Hak, her collapse in Fuuga, her meeting with Yun and Ik Soo, and the gathering of the four dragon warriors all proceed along their familiar path. The difference now is invisible but profound: somewhere on Kouka’s coast, three people who once served the palace watch the kingdom they loved tear itself apart, choosing to remain ghosts rather than return to a castle that betrayed them.
Chapter 4 braids their hidden lives with the canon’s rising tide, culminating in Yona’s arrival at port Awa in search of the green dragon, Jae ha. By now, Aren has reclaimed much of his old personality. He is fierce, blunt, and unafraid to put hardened pirates in their place, which earns Gi gan’s open approval and makes both Taeyul and Rin quietly proud. Yet scars remain. Aren still does not trust anyone from Hiryuu Castle. He remembers how Soo won, a boy he once played with alongside Taeyul, raised his hand to kill them without a flicker of hesitation. For Aren, the betrayal is not just political it is personal.
Taeyul has hardened too. The gentle instructor who played with a lonely child princess is still compassionate with Rin and Aren, still teaching with patience rather than cruelty among the pirates, but when it comes to anyone tied to the royal family, his trust is gone. His vow to kill Soo won remains unshaken, yet it now coexists with a quieter, more desperate oath: to never again allow the palace’s wars to drag Aren and Rin into danger. For him, their safety comes before revenge, before justice, before everything.
When Yona and her companions finally reach Awa, their worlds collide again. Yona and Hak are stunned to see Taeyul alive, standing in the harbor as a pirate swordsman rather than a Sky Tribe instructor. Aren, sensing their presence and the flood of memories it brings, immediately hides behind Rin, fingers twisting nervously in both his fiancé’s and son’s hands. Rin’s protective instincts sharpen: he will not let anyone, least of all the remnants of a palace that destroyed their peace, make Aren cry again.
Yona, who once adored Soo won and now seeks to overthrow him, tries to reach out, remembering the man who used to play with her when her mother died and her father was too busy to notice her loneliness. Taeyul’s response is ice. He brushes her off, pretending not to know her, refusing even to entertain a conversation. When she persists, still trying to speak, Rin snaps. He lashes out at her, voice shaking with years of fear and anger, blaming King Il’s killing of Prince Yu Hon for starting the chain of events that allowed Soo won to seize the throne and shatter their family’s happiness. He tells Yona that if she wants to reclaim the throne, she should do it herself without dragging other families into another round of bloodshed. Then he turns away, clinging to Aren and guiding him back to their room, leaving Yona stunned and on the verge of tears.
Taeyul seals that distance with words that hurt them both. When Yona approaches yet again, Taeyul tells her bluntly to go away and leave them alone. For Yona and Hak, it is like looking at a stranger in a familiar face. The kind instructor who once shielded the weak has become someone harder, lined with the quiet cruelty of grief. It is not that his heart has died, but that all of it now belongs to Aren and Rin. The old kingdom has no claim on him anymore.
Chapter 5 examines the emotional aftermath of this almost-reunion and sets the stage for the larger war that still lies ahead. Yona walks away from that encounter carrying a new weight: an awareness that the kingdom’s fall did not only break her life, but also the lives of countless others who will never stand beside her as allies. She learns that justice, even when righteous, cannot erase the pain that has already been carved into people’s hearts. Her resolve to defeat Soo won solidifies, now fueled not just by her father’s death but by the image of Aren trembling behind Rin, Taeyul’s cold eyes, and the knowledge that her cousin’s crime robbed them of far more than titles or positions.
For Aren, Rin, and Taeyul, life continues in the shadows. They help Gi gan’s crew dismantle the corrupt trade in Awa, indirectly aligning with Yona’s own efforts, yet they do so without revealing their past or their survival. Their actions become part of the same tide Yona is raising against injustice, but they resist being swept back into the castle’s orbit. Taeyul still intends to someday confront Soo won and make good on his vow, but he will choose his own time and place, not be pulled into someone else’s destiny. Aren, who once trusted the Sky Tribe as his home, now considers home to be nothing more and nothing less than the two people whose hands he holds. Rin, standing between his parents’ pain and the wider world, grows into a man who can both protect and challenge them, pushing them to live rather than simply hide.
The book closes not with a grand battle in Hiryuu Castle, but with a quieter, more haunting image. On a night when the sea is calm and the air is heavy with the scent of salt, Aren, Taeyul, and Rin stand together on the deck of Gi gan’s ship. Far inland, a faint red glow stains the horizon where Yona’s path is still unfolding. Aren slips his smaller hand into Taeyul’s, and Rin covers both their hands with his own, larger and steady. They say nothing of vengeance or kings. Instead, they promise each other, once again, that no matter how the kingdom’s story ends, they will choose each other first.
Vows Beneath a Crimson Sky is ultimately a story about surviving the shrapnel of history. It invites readers who love Yona of the Dawn to see familiar events from a new, intimate angle, and it offers new readers a self contained tale of three people who were never meant to be heroes, yet become the moral compass of a kingdom that forgot how to protect its own.
