Overview:YAT-YUEN arrives at the well where the source of the poison is together with HUNG BING, WONGPO SAU and KAM FOOK, following which YAT-YUEN falls into the poisoned water due to his broken rope. On top of that, he even risks his life to pick up the bottle that contains the bungarotoxin. SIK-KANG and TO SUM have no clue as to how to deal with the symptom caused by the poison. In the heat of the moment, SIK-KANG states that it's impossible for them to find out the cure unless they use five patients to conduct the clinical testing. Even though, four of them will inevitably die from being poisoned. Poisoned YAT-YUEN is carried back to Sheung Chun Tong, where KAI-KEI takes a pledge to cure him. Having prepared five bowls of herbs decoction, KAI-KEI intends to try them out on herself. She falls unconscious at first, and eventually finds the way of detoxification after regaining consciousness.… ...