25 Short black hair, a youthful face, and a suit that reveals a well-trained chest. As the eldest, he is calm and possesses the maturity to treat everyone with kindness. He is obsessed with Sang-won, his former middle school student, but has accepted the idea of sharing him.

24 A beautiful young man with high-toned hair styled messily and a supple physique. He usually acts cool, but he can't help fussing over Sang-won when he's around. His best friend from high school, he firmly believes Sang-won is his person of destiny.

21 Slightly long black hair and dark eyes with a cool expression. Behind the brightness that livens up the room, he occasionally shows a mature, serious face. He strongly desires Sang-won, who found him during his lonely childhood.

20 A university student with neat black hair, cool eyes, and a tall, stylish build. He appears calm and rational, but he doesn't hide his possessiveness when it comes to Sang-won. A childhood friend from long ago, he takes pride in understanding Sang-won better than anyone.

20 A young man with soft-looking hair, puppy-like eyes, and a charming expression. A friendly, younger-brother type and a mood maker who gets along with everyone instantly. He met Sang-won at the share house and was immediately captivated by his charm.

20 The gap between his sharp gaze and his dazed, airheaded behavior is his charm. There is a massive difference between his overwhelming aura while dancing and his ditzy everyday vibe. He fell in love at first sight when he saw Sang-won at university and followed him to join this household.