Plot: During his conversation with the mystery person, CHIN-CHEUNG agrees to do the trade as soon as they kill TING-MING and SUN-FUNG, but the mystery person requests CHIN-CHEUNG to let SUN-FUNG go. CHIN-CHEUNG and CHI-TING return home and see SUN-FUNG, and it turns out that SIU-MEI asks SUN-FUNG to conduct an investigation as she is afraid that CHIN-CHEUNG might be harassed again