Soo-bin is the rockstar/singer among the guys. His attractiveness is similar to Ji-hoo. Soo-bin starts off as Jae-yoo's companion in the new home, and in contrast to Ji-hoo (even though they are good friends), he's tame and willing to talk to her. He tells her that Ji-hoo is a good person once you get to know him.
He also starts to like Jae-Yoo. Even after he found that Ji-Hoo and Jae-Yoo became couple, he doesn't give up and continues trying to make Jae-Yoo his.