A very innocent girl fell in love with a boy who had been waiting for her all her life. When she entered the class as a transfer student, the little girl looked back at him and decided that this boy would be her future partner. An old song triggered a series of memories about the boy and her school days and after work. Due to the delay in getting a response from him, she met a mature and steady man under the arrangement of her family. This man captured the woman's heart because of his tolerance and generosity, but the woman could never forget the man who had deep love in his heart. Because of this, she felt very guilty. She felt that she was an unfaithful person in this marriage. Many times she cried because of him - the man she loved so much. He was very low-key and gentle, never revealing his inner feelings until his wife passed away, and he began to realize that the person deep in his heart was not his wife. When he learned that she was living a good life, he did not bother her. When he was dying, when she rushed over, she only heard him say, "I've finally waited for you," and then left this world. She burst into tears on the spot. I got his diary by chance and learned from it that I was not in unrequited love. It's a pity that he is no longer here. She was heartbroken again and was hospitalized due to asthma attack. The most touching thing was that the man beside her had been silently doing all the things she liked by her side, making her less regretful. The love of three people, the waiting of three people, finally cannot wait for time.