A classmate of Ji-Ho, Soo-Han, and Hye-Bin. At school he is quiet, sits in the back, and does not draw attention to himself because he doesn't want to be noticed. He comes from a religious family and his father is a pastor.
Originally he gets involved with Ji-Ho and Soo-Han as part of a deal with Kyung-Ho attempting to break the two up.
Later on, he works against Kyung-Ho, then befriends Ji-Ho, Soo-Han, and Hye-Bin.
Ji-Soo is also gay and is hiding it due to his family. He dresses differently in public so that he is not recognized.
