Zhang Jian He, a reserved and rather introverted cartoonist, is dating a beautiful and conservative girlfriend, Ya Shi. One day, in an unfortunate dispute with his best buddy Chen Jun, is accidentally killed by Zhang Jian He. To cover up his deed, Jian He cleaned the bloodstains and any entailing evidence of the crime scene and found a unique and creative way to dispose of Chen Jun's body. Soon Jian He discovered a shocking truth: Chen Jun was sleeping with Ya Shi all the time. Zhang Jian He felt the utmost pain for being cheated by his best friend, and the girl he loves is just a slut. The story soon brought out traces of a serial killer Jia Ming, who murdered his own father when he was a minor. Disguised as a policeman, Jia Ming returns to his killing spree soon after his released from the prison, and through an online instant messenger, Jia Ming gets to know Zhang Jian He. Curiously, Jia Ming paid a visit to Jian He's home and discovered that Ya Shi is accusing Jian He for the murder of Chen Jun. The story follows with an enticing, dark and humorous line which will change the life of Jian He and Jia Ming forever.