Mum started his career as a comedian in the Bangkok "cafe" scene (restaurants in Thailand with live music and comedy performances).

Martial arts action was choreographed by Panna Ritikrai, and Ong-Bak's Tony Jaa plays a small part as a fighter in a supermarket.

In the Thailand National Film Awards, Yam Yasothon received a best-actress nomination for Mum's co-star, Janet Kheaw.

In 2005, he starred in Midnight My Love (Cherm) as a loner taxi driver who has a relationship with a massage parlor girl.

At the end of 2005, Mum starred in Ghost Variety (Pee Chalui), a comedy-horror story in which he plays the director of a reality TV series that searches for spirits in haunted places.

The movie is a prequel that tells the story of his character Khumlao and how he came from the fictional country of Nongwaileum to work in an undercover police assignment in Thailand.

His character posed as a luk thung singer named Mummy Lao, so in addition to action and comedy, the film features singing and dancing.