Bai Ze is an ordinary high school sophomore. His father is away from home all year round and he lives with his mother. The only thing that is unusual about him is that he knows some martial arts. The arrival of his cousin Yuan Zijing brought some changes to his life. As time goes by, the relationship between Bai Ze and Amethyst has become subtle and abnormal in the six months they have been together, but the two of them enjoy this feeling very much. One day, the girl Shen Yinhe sought revenge on Shangyuan Amethyst, and the two had a fight, but there was an unknown conspiracy hidden in it. The strange behavior of Bai Ze's mother hides clues to Bai Ze's father who has been hidden for many years. Just when Bai Ze and Amethyst were about to discover their father's whereabouts, Yuan Amethyst suddenly transformed into an assassin and used her strange ability to erase all of Bai Ze's memories of her, including their ambiguous relationship. Why did Amethyst approach Bai Ze? Can Bai Ze's memory be restored? What is the mysterious organization behind Amethyst that has not yet surfaced?