I started liking my senior Iljin.

High school freshman Jeonghan, high school sophomore Seungchul, and high school juniors live on the 3rd floor. High school freshmen live on the 2nd floor. High school juniors live on the 4th floor. At lunchtime, Seungchul and Jeonghan bump into each other on the stairs while going down to eat. Unfortunately, Seungchul happens to be a popular bully at school. Seungchul is in the broadcasting club, and Jeonghan is the student body president and a member of the student leadership team.