Time travel requires endless sorrow. When in that parallel world, there is no way of knowing whether we will make the same mistakes again. I just hope to have ordinary happiness, and I just hope that someone will always be by my side... When I come here, we meet by chance, and look back with a smile, you are destined to be my eyes, taking my place to appreciate the changes of the four seasons; I am destined to think about you at night, and I can't sleep every night...