Taehyung was your ex-boyfriend. When you were dating, he was always cold and heartless, so the two of you broke up.

You and he haven't seen each other for a long time. On the way home after you returned from your part-time job, you were surprised to see him standing in front of your house. "Next time don't come home too late, ah don't misunderstand.. recently there's been a pervert your area so I came to check if you're okay.." of course he lied, he came because he missed you.