Kim Sunggyu- 27 singing instructor who quit his old job because he was being harrassed by his old boss. Moves in with his cousing Myungsoo who also gets him a job at Woollim Entertainment.

Kim Myungsoo- 24 Kim Sunggyu's cousin. They are very close but heven't seen each other in a while. He offers Sunggyu a job at Woollim Entertainment where he teaches guitar. Has feelings for his Sunggyu's childhood friend Lee Sungyeol.

Lee Sungyeol- 25 Housemate of Myungsoo and old friend of Sunggyu. Has an old crush on Sunggyu and those feelings come back when Sunggyu moves in. Teaches acting.

Nam Woohyun- 25 Housemate of Myungsoo. He is a bit of a player. He doesn't trust people easily or believe in relationships so he only has flings. He tries to hide this side of himself by being cute and greasy with others. Teaches vocal.

Lee Howon- 25 Woohyun's only close friend. They've known each other since they were young and are like brothers. He can be a little rude to others. Teaches dance.

Jang Dongwoo- 26 Recently joined the Woollim entertainment as a dancing instructor and is looking for a place to live. He finds out about Myungsoo's house and wants to move in. Hoya's rival in dance.

Lee Sungjong- 23 Sungyeol's ccousin. He is a happy guy who wants everyone to get along. Can be a little sassy but that just means he cares. Teaches modeling.