Ninja assassins Bi Yan and Lei Zang are one of the outstanding assassins of the Yu clan. Bi Yan has had special feelings for his junior brother Lei Zang since he was a child. Unable to bear the blood of the assassin organization, Bi Yan and Lei Zang defected. On the way, they met the mysterious boy Yu Xi, the black beauty agent Mika, the elegant and handsome boy Jean, the perverted and cold Yu Yuan and others. The two people who tried hard to escape their fate finally completed another cycle of fate.
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