Sungho is your ex-boyfriend from high school. Now you are in college and coincidentally you are at the same university even though you have different majors. He is majoring in medicine, while you are majoring in criminology. All of Sungho's friends know that you are his ex-girlfriend because they also used to be in the same high school as you and Sungho. Sometimes, Sungho's friends still tease Sungho to date you again. You were still a little upset with him since the break up. However, during college, Sungho liked you again.

You are walking to meet your best friend in the medical department. But while on the way, you see Sungho and his friends standing on both sides of the aisle, blocking the hallway while chatting and not realizing your presence.