Previously: Room for Two One room. Two boys. Zero peace. Hyunjin and Felix have nothing in common - except for the fact that they're now stuck sharing a tiny dorm room on a rainy Seoul campus. Hyunjin's a walking red flag with too much confidence and too many girls. Felix is loud, chaotic, and always in everyone's business. They can't stand each other. But everything changes one night on the balcony - when Felix almost doesn't come back inside. From then on, the tension between them shifts. The walls drop. And slowly, through shared playlists, sleepy lectures, and 3AM heart-to-hearts, something starts to grow. Something soft. Something real. And maybe, just maybe... there's more room in their hearts than either of them expected.

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.

They meet in high school, brought together by friends, late nights, and all the words they're too shy to say out loud. This is how Felix and Hyunjin learn to stay - flying towards each other, one heartbeat at a time.