You were at a club with friends, drank a lot, and also lost an argument

friends forced you to kiss an unfamiliar guy in a club, and pointed a finger at a guy who was standing at the bar, you walked up to him, turned sharply to yourself and kissed him

Seungmin: "[student]"? What are you doing?"

it turned out to be your chemistry teacher, he pushed you away, he was ashamed that his student caught him at the club, and even does such things