Two years after the world fell silent, survival has become routine. In the ruins of a forgotten city, Hyunjin keeps count of the days. Felix keeps the others alive with laughter. Together, they've built something close to peace - a fragile base of warmth in a cold, dying world. But when a routine supply run goes wrong, the cracks begin to show. Whispers of a cure resurface. Hope takes root in a place it shouldn't. And in the space between fear and devotion, love becomes the most dangerous thing left alive.

They called it a rehabilitation center. White walls, padded chairs, a circle where patients confessed their obsessions like sins. It was supposed to fix people like Felix-teach him that his need to cling, to crave, to want too much was an illness. But then he noticed the boy across the room. Hyunjin. Patient No. 07. Too pretty, too untouchable, too sharp around the edges. Felix wasn't supposed to stare. Hyunjin wasn't supposed to notice. And yet the glances stretched longer, the silence heavier, until the line between treatment and temptation blurred. They wanted to cure him. But obsession can't be cured. It only shifts.

Hyunjin fell first. Felix believed second. Somewhere in between, they loved each other so recklessly it terrified them both. It began with laughter - stolen glances, quiet warmth, that dangerous kind of comfort that feels too much like home. Before they knew it, friendship had blurred into longing, and longing into something neither could name. Felix's world burned brighter. Hyunjin's heart beat steadier. Every look, every touch, every kiss felt like forever. But forever doesn't come without a cost. Love is tested - by distance, by time, by the people who can't understand it. And when it all falls apart, they're left with only the promise that once bound them together. A vow louder than fate. Stronger than circumstance. "I promise I will find my way back to you. God, I don't know how, but I will, because I promised you."