3 Num 3 Mum tells the stories of 3 young brothers living together, representing different people in society. It reflects society's problems, and the love of family ties.
Ekkapol, the eldest brother, is a manager. He has a systematic way of living and is conservative person. Tossapol, the middle brother, is an architect who prefers to live a simple life. He doesn't like rules and has a modern way of thinking. Peerapol, the youngest brother, is a junior in college.