After much deliberation, Chi Kiu decides to join Unlimited Slash Limited and works undercover to help stop Mr. Mo from confessing to Zan Zan. When Chan Yau Shing breaks the news of his engagement party, which will take place in a month, the trio has to work fast to make Mr. Mo give up on Zan Zan. However, they are put in a bit of a dilemma when Mr. Mo suddenly shows up at their office.