He's rain-soaked, cigarette-stained, and completely untouchable. Until I touched him. In the middle of a Seoul downpour, Felix meets a stranger beneath a flickering streetlamp. Hyunjin is homeless, high, and hiding from the world-with sharp words and trembling hands that don't know how to be held. He smokes like it's the only thing keeping him warm. He doesn't believe in kindness. Or second chances. But Felix isn't walking away. Not tonight. Not ever.

They're rivals. They're roommates. They're trending every time they breathe near each other. The internet ships them. They can't stand each other. (At least... that's what they keep telling themselves.) When one viral moment blurs the line between fake and real, offline starts feeling a little too intimate-and suddenly, "I hate you" starts sounding a lot like "don't leave."

They were each other's first love. And their first heartbreak. Felix and Hyunjin haven't spoken since high school-since one goodbye tore them apart. Now they're debuting in the same idol group. To the world, they're rivals. Strangers. Behind closed doors, they're something messier. Bitten-back words. Lingering stares. A history neither of them knows how to bury. But feelings don't fade just because time passes. And love doesn't always listen to reason. Because what do you do when the boy you thought you lost forever... is standing right in front of you again? This is their second first love. And maybe-just maybe-it's the one that lasts.