This person must know you. But you don't know him. He added you on purpose to fall in love with you. There are two possibilities, one is just for fun. The other is that I like you, but I lack courage, so I ask you Q first, add you, chat, and then ask you if you want to fall in love.

If you don't want to fall in love, or don't have much affection for him, you can ignore him. After all, you also have your own goal, which is to take an undergraduate course. Don't waste your time or even ignore your goals because of a stranger.