In order to fight for YEE-LIM's reward, everybody tries hard to find the spy in the company. WAI-WAN reveals that she has watched all the recent CCTV videos with SAM-LAM. They discover that a man has brought a woman to the office in one evening but they fail to recognize them. WAI-WAN discovers that somebody has used YAU TAT's photocopy card to print a large amount of their partner SAM's client information. WAI-WAN believes that somebody has picked up YAU TAT's card and used it. CHI-HUNG admits that he has picked up the card before. However, he has no idea of what happened at all since he was drunk in that evening. YEUNG KWONG asks FAI-TING to help finding the person with YAU TAT and FAI-TING seeks help from his father. CHI-HUNG remembers the name of the model he met in that evening. They return office to inform YEE-LIM but they discover that the model is in YEE-LIM's office already.… ...