In order to find MAK SEI, they go to a village where they see MAK TONG, aka Uncle TONG. Following a clue, they arrive at a second-hand shop to invite MAK SEI to join their detective agency. Ironically, they are instead being pranked. Though KA-KA has gone through the effort to find the eggs requested by MAK SEI, MEI SEI emphasizes that he is not going to join them unless he eats the egg puffs made by Brother HONG in person. Eventually, they manage to fulfill MAK SEI's wish and make him feel the sentimental value that the food holds. Therefore, MAK SEI agrees to join the agency. SAU-NA tells TAK-KEI to stay up all night to look after MAK SEI, which almost leads to catastrophic consequences. With MAK SEI's joining, SAU-NA is hired to investigate an injury on duty case, alleging SILLY CHIU is involved in a fraud. TAK-KEI is harassed while monitoring the suspect, and he is almost run over by a car.… ...