Gun Atthaphan Phunsawat is a Thai actor signed under GMMTV. He started to study Business Administration at Bangkok University before switching his studies to Political Science at Ramkhamhaeng University.

At a young age, Gun entered the entertainment industry supported by his mother who knew about her son's ambitions. He auditioned for film companies and became the first winner of The Boy Model Competition 2003. He had his first lead role in 2004's "Gomin", one of his more popular works domestically.