His older brother loved boxing since childhood and he often secretly followed him to practice.
At 10 years old he had his first fight and received a purse he gave to his parents to support the family.
[2] Mongkoldetlek had good results which led him to be fighting under the prestigious Kiatpetch promotion at Lumpinee Stadium.
[5] Mongkolpetch faced Elias Mahmoudi in the main event of ONE Championship: Full Blast 2 on June 11, 2021.
[7] Mongkolpetch faced Jonathan Haggerty at ONE: Bad Blood on 11 February 2022.