A boy rang his girlfriend and said that he couldn't spend their third anniversary together due to unforeseen circumstances. Strangely that day, the boy begged his girlfriend to visit an old bookstore to purchase a book. She felt the relationship had become more and more unromantic over the three years together, since their love for each other had become increasingly monotonous.
Later that day she went to the book store in disappointment, where the kind bookkeeper took her to find the book. Upon finding and opening the book, a thick envelope dropped out, which contained an archive of all the love letters they had sent each other over the three years. He had collected from the original shyness to later warmth during their three years. The bookkeeper told her that her boyfriend came to the shop and hid the envelope in the book to give her a surprise. What made her feel moved most were the love letters rather than the surprise itself. These letters could help them review their story of love though time flies. Although time is passing, just showed looks at different stages.