SHEUNG doubts that the “MO” in front of him is pretended by MAN. He asks “MO” many questions at night but “MO” affirms that he is not MAN. “MO” says he suffers from hemoptysis during the meeting with TUNG’s brothers and he wants to be a good official before his death. Another homicide case has been reported at that time. CHAN MEI-OR accuses that WONG has killed her sister. The neighbors also point out that WONG has physically abused her daughter-in-law (i.e. OR’s sister). When “MO” hears about this case, he proposes to co-investigate with SHEUNG. During investigation, SHEUNG finds that “MO” has well versed techniques and doubts his real identity again. By their painstaking investigation, they find out the murderer is…… SHEUNG keeps investigating “MO’s” real identity and worries that MAN has killed MO and replaced him in order to save TSE’s family. “MO” is angry and has a big quarrel with SHEUNG.… ...