Boonchoke failed an entrance exam last year, but this year he makes it through into the medical school of a famous university in the north of Thailand. But the medicine he's studying is not the modern one, it's traditional herbal medicine. Boonchoke's parents, Boonchu and Molee, agree to let their only son go live in Chiang Rai for his study.

The story starts with the next generation of the original Boonchu films. Boonchu and Molee send their son to Bangkok. How's Boonchoke going to handle the unexpected situation in the big city?