Thitisan began his career in 2018, as a contestant on season two of the Thai male modeling competition series The Face Men Thailand, where he was a runner-up.

During the competition, he was on the team of Thai fashion designer Polpat Asavaprapha, and went on to advance to the show's finale, where he placed as a runner-up.

[6] Thitisan later returned to the competition the following year for season three, this time on the team of Araya Indra and Ajirapa Meisinger.

After his elimination from the competition, Thitisan began a career as an actor and model in Thailand, appearing in films and television series.

[8][2][9][10] As of September 2024, Kim, during his reign as Mister International 2023, apart from his home country Thailand, has visited the Philippines, Vietnam, Cambodia, Nepal, the Maldives, Bhutan, Taiwan, India, Indonesia, and South Korea for various events, primarily as a member of jury for beauty pageants.