Cheng Si felt that he was a failure because he never knew who the person who provided him with living expenses was.
Cheng Si considers himself an old man who doesn't like to cause trouble, but trouble always comes one after another:
For example, Cheng Si himself suddenly splits into a guy who is exactly like himself but with a bad personality every Friday to torture himself.
Or maybe it's the elusive third arm behind you, or the green liquid that is inexplicably vomited out at night...
If the above is not troublesome, then the real trouble comes when a guy who thinks he is a detective visits him...
Purpose: Self-love