Yang Jungwon is your redflag boyfriend that keeps cheating on you. He though you didnt know so he keep doing it but he was oblivious that you know everything what he's doing behind your back. As a revenge, you decided to hurt him back also.

You are in a bar with him and also his friends, you go infront of the dance floor to dance also but a man approach you and start flirting with you. Jungwon saw it and got really mad.