YI and CHI go to Japan to enjoy their holiday. Before getting abroad, YI meets HO whom is believed to have died for five years. YI delays his trip to find what has happened. YI and HO lived in the same walled village. HO left her home as she was forced to marry a man that she did not love. She went overseas to study design. SAN was HO's boyfriend. The police questioned him and suspected that HO had been killed by SAN as some blood stints were found on his jacket. SAN admitted that he had been in HO's house. Though he was suspected, the police did not have strong evident to prove him guilty. SAN was set free. Later SAN killed himself and left a letter stating that he felt guilty. YI checks the file of HO's case. He is shocked to see that SAN cannot kill himself with the rope as he used his left him. YI suspects that it is a homicide.

YI visits FUK, who is SAN's father. It is too late as he has died for two days. The way of handling the rope is the same as SAN’s. FUK has no reason to kill himself. There are a Double-T ticket and a map in his pocket. With the help of the map, the police find BILL's corpse. BILL is a wanted criminal who committed a bank robbery five years ago. He was killed but the money is not with him. As BILL and HO have the same blood type, thus five years ago, BILL was killed instead of HO. It is clear that the one who has taken the money is the killer. SAI, CHOI and KEUNG are suspected as they became rich in the past five years. MAN returns to FUK's house and a needle is found. She realizes that FUK was paralyzed and became unconscious before being killed. They check FUK corpse and MAN's idea is proven.

KEUNG is the only one who knows Chinese medicine and the use of needles. YI is aware of the unnatural response of KEUNG's wife PING. He follows her and finds HO being locked up in a deserted warehouse. PING is going to deliver a baby. YUNG sends her to hospital and tries to contact KEUNG. He cannot find KEUNG as KEUNG has gone to Devil Hill with YI. YI and KEUNG are good brothers. YI tries to convince KEUNG to surrender himself to the police. He does not know that his life is endangered. SAI, CHOI and TSUI are KEUNG's colleagues. They try to kill YI. YUNG comes and fires his gun. TSUI is so afraid that her gun hurts SAI. She and KEUNG run away. KEUNG is arrested. He goes to the hospital and he finds that his wife is safe. He tells the police everything about the case. SAI dies as he has been injured seriously. TSUI kills herself as she feels guilty. CHOI is arrested.