The teacher comes in and apologizes to tangtang for stealing the lock that he gave him as a gift. He says that he wants to give the lock to his son, but he can't because it's a gift from tangtang. The teacher tells him that uncle Xu likes his mommy very much, and that's why he wants the lock. He also says that the car is so complicated, but that he's managed to put all the pieces together quickly. He hopes that they can be friends forever. .