KAI-CHUNG frankly discloses his identity as an undercover police officer to LOK YEUNG, and shows her some evidence. LOK YEUNG comes to realise that CHING-TUNG and CHING-LAM are siblings, and SWEET POTATO's real identity before his memory loss is CHING-TUNG. She then asks KAI-CHUNG why he didn't bring CHING-TUNG back to Hong Kong to expose Inspector WONG's real identity. KAI-CHUNG replies that he also smelt a rat and thought Inspector WONG must have something to do with it, and that's why he asked YI-LEI to probe into the matter. SHEK LAM, who used to be YEE-SHAN's martial arts student, goes to the Wudang Mountains to look for SING-YU, without knowing that her own daughter also follows the same master to learn Kung Fu. In response to LOK YEUNG's query as to what CHING-LAM's final words were, KAI-CHUNG tells her that his late girlfriend said she should make a lemon cake, and he admits he has no idea what that means.… ...