DOK and YAN see the publicity poster about blood donation. DOK intends to go for blood donation together with YAN as to get free medical check-ups at the same time. Yet YAN finds excuses and rejects him. YUNG and KEI wet the rucksack of YAN. While getting the things out of the rucksack, they find two DNA reports. KEI finds from the report that the DNA between him and DOK do not tally and YAN has to make a clean breast of the truth. YAN explains that he hopes to change a miser DOK into a generous DOK as he used to be. KEI and YUNG decide to help YAN; moreover, YAT comes up with a good strategy to make DOK change… DOK is shocked to see that YAN suddenly throws up blood. YAN exposes that he is suffered from leukemia… YAN, YUNG and KEI bring DOK to buy a lot of good food back to Hei Chung Lau. YAN squanders the money of DOK lavishly.… ...