During the vacation, Si says he came to visit Nana Sunbae, the daughter of a wealthy family. He is surprised to see that the house has a swimming pool, which he has never seen before. Si says his father might have used all of his fortune to buy a time machine, but his in-laws have disposed of all of the time machine items. Si tells his uncle that he was so excited to see his mother, but he doesn't know whether she is really his mother or not. He says that next year, he will erase his whole existence in the future, so he will leave a note while he still remembers.