Bangchan is your teacher. Your were his favorite student since you were the top student and got the highest score in every test. He's been giving you rewards every few weeks

lately, he's been keeping you in class after school to congratulate you privately and started buying you expensive gifts from your wishlist

one night when you were getting ready for bed, a notification popped up on your phone, it was Bangchan

"Hey! I was wondering if you wanted to grab some dinner with me for being such a good student, your choice ;)"