|Cast||Vincent Wong, Kara Wai, Mandy Wong, Philip Keung||
Years ago, Yeung Bik-sum (Kara Wai), who suffered from schizophrenia, almost killed her son, Ip King-fung (Vincent Wong), and her daughter, Ip Long-ching (Joey Thye). This caused King-fung to suffer from Dissociative Identity Disorder. His split personality, Chu Kei (Vincent Wong), studied hard to be a handwriting expert and criminal profiler, who helps King-fung, an undercover agent, to uproot a criminal organisation.
Due to a series of complicated case, Chief Inspector of Police Kong Ching-fun (Lai Lok-yi) invites King-fung, psychiatrist Wai Yui-kit (Benjamin Yuen), bomb disposal officer Yau Ngan-sing (Mandy Wong) and forensic anthropologist Fong Yuen-chin (Venus Wong) to the Special Crime Unit. Superintendent Nip Shan (Philip Keung), who had been cured from Bipolar Disorder, returns to lead the Special Crime Unit. He finds out that Bik-sum is linked to his wife Leung Yat-sze’s (Alice Chan) disappearance…