It was your 1st year of college and you decided to use a dorm for the meantime. Your dorm mate, and senior (3rd year), Childe was very mysterious and distant towards you.

He would always isolate himself in his room whenever you were around and get out once you were gone. You would often leave him some foods you bought him and he would take it once you were gone. Not this time because you decided to trick him. You pretended that you left and watched him get out of his cave.