Saint Suppapong Udomkaewkanjana is an actor, rapper, and singer born in Trat Province, Thailand as Huang Mingming, a Chinese name given by his great-grandfather. He is ethnically Chinese since his parents' family's ancestors were from China.

He graduated from Tradtragarnkun School, Trat Province, and Assumption College, Bangkok. In 2021, he graduated from the Faculty of Economics at Srinakharinwirot University. In childhood, He started activities for the benefit of the public in grade 4. During his studies from high school to university, he participated in various volunteer camps. Until in 2017, he received the Person of the Siam Award in the outstanding youth for society category.

Saint made his acting debut in 2018 with the Thai BL series "Love by Chance". On 14 July 2019, he released his debut single “I Crush On You” as a gift to his fan club, which he jointly invested in and co-produced. During that same year, he joined the boy group KissBoysTH, which consisted of 5 members, but disbanded in 2019.

In 2020, Saint also started his popcorn dessert business, which aims to promote the economy in the community. And established the Idol Factory Co., Ltd. for producing television programs on April 24, 2020.

On February 24, 2022, he officially joined channel 3.