Incidentally YUNG finds a boy's shoe in KAN's house and it is of the same pair of another one being found in TUNG's house. KAN knows that his secret is discovered and admits that he is involved in the case. TUNG kidnapped KAN's son to take vengeance on KAN. KAN kidnapped CHUN so as to get the money to save his son. A corpse is found in a construction site. WING checks it and finds that the man died six or seven years ago. He has six fingers and wounds are found on his bones. YUNG seeks help from HIN. With computer technology, HIN rebuilds the dead man's appearance so as to identify him.