"When perfectly replicated DNA starts killing people, the only flaw is - I love you."
Cheng Weiyu, a talented girl from the Department of Chemistry, discovered that after her sister committed suicide, she discovered that the silver butterfly tattoo on her body was the same as that of the victim of a serial murder. Forced to assist the police in the investigation, she meets Shen Zhao, a criminal police officer who suffers from emotional perception disorder. While solving a series of surreal cases, the two gradually uncover a dark experiment involving human cloning and memory tampering.
When Cheng Weiyu discovers that her DNA has been perfectly copied by the murderer, and when Shen Zhao's memory is cleaned again and again by M, the mastermind behind the scenes, the only way to break the situation is to bet on the "irrational variable" that the other party hates most——
love.
