Sorry! I Forgot... II

MA CHONG discovers that MA FU is depressed and MA YAU says that CHI-LEI is the origin of the problem. CHI-LEI tries to return the money to CHI-YAN and CHI-YAN reveals that he has taken it from her moneybox already. CHI-LEI remembers that LAI-SHEUNG has mistakenly put MA FU's moneybox in her room. MA FU adjusts the length of his new trousers by himself and he discovers the moneybox again suddenly. MA FU finds that a 500-dollar note is missing but he doesn't know where he has spent it. When MA KEUNG goes out with MA FU, LAI-SHEUNG goes into MA FU's room to adjust the length of his trousers and she put a 500-dollar note into the moneybox as well. Without realizing what LAI-SHEUNG has done, CHI-YAN goes into MA FU's room again to adjust the trousers and put another 500-dollar note into the box……