He first discovered Muay Thai by watching fights on television and later started training with the encouragement of his older brother.

There are also alternate ways to anglicize Nungubon's ring name such as Neung Ubon Sit Lertchai, Nung-Ubon, Neungubon, etc.

Nungubon was born with his left leg longer than his right, resulting in the Thai media nicknaming him Tuan Pae (translates to "The Limp" or "The Lame").

Another one of Nungubon's signature techniques which can repeatedly be seen in his fights is his powerful right cross which he would use to KO Wangchannoi Sor.Palangchai and to knockdown "The Batman" Samkor Kiatmonthep or Kaensak Sor.Ploenchit.

[3] Nungubon's prime lasted from 1990 and 1996, during which he would earn 3 Lumpinee titles in 3 weight classes against elite fighters such as Kompayak Singmanee or Langsuan Panyuthaphum.

Nungubon stated that his favorite memory from his career was winning the Lumpinee mini flyweight title (105 lbs/47.6 kg) against Kompayak Singmanee in 1990.

Nungubon would continue to challenge elite fighters including the Sitjaopho twins, Fahsuchon Sit-O, and Anuwat Kaewsamrit between 2000-2003.