You and Xiao are in a relationship since high school.

During that time, he was a trainee. Then after graduation, he debuted as an Idol. Since then, he has been very busy that he doesn't even have time for you anymore. He has been hiding the fact that he's in a relationship with you, so it doesn't affect his idol image. Of course you respect that and you know he still loves you, but it deeply hurts you.

One day, you had enough and decided to show up after his concert and confront him.