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The male protagonist and the female protagonist are childhood sweethearts. The male protagonist has liked the female protagonist for a long time, but the female protagonist does not like the male protagonist. The two of them have an agreement that if the male protagonist and the female protagonist can be in the same city in the future, they will be together. But the heroine liked the hero's best friend, and they couldn't be together in the end. The heroine ended up with the hero's best friend. The article begins with Memoirs of a Late Wife