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I am a passer-by that you turn around and forget about. Why should I accompany you to the end of the world in wasting your time? Since you are heartless, why bother with me! The male protagonist and the female protagonist of this book fell in love on campus. The reality is always so cruel. The female protagonist left the male protagonist to have fun again and again without any reason. The male protagonist also chose to forgive every time. Until one time, the male protagonist broke up and started a series of acts of revenge... Where should they go like this...