[4] For his Bachelor's degree, Suppasit studied at Kasetsart University, majoring in industrial engineering where he graduated with First-Class Honors (Gold medal).

[8] Suppasit then began his acting career in the Thai boys' love (BL) series I Am Your King in 2017.

In early 2019, Suppasit was cast as "Tharn", one of the main protagonist of GMM One's and Line TV's TharnType: The Series.

[13] In 2021, Suppasit starred in a short action film titled Undefeated by Garena Free Fire Thailand, along with Urassaya Sperbund and Luke Voyage.

The project aimed to expand a communication boundary in the society, giving everyone equal access including the visually impaired and people with hearing disabilities.

[15] In 2022, it was announced that Suppasit would produce and star as a lead in The Ocean Eyes, a series about the life of marine veterinarians, opposite Tul Pakorn, who would become his fiance in 2024.

[16][17] The production was also announced to include global filmmakers Rick McCallum of the Star Wars prequel trilogy, Herbert Primig.

[23] Suppasit made his official debut as a singer upon the release of his first single, titled "Season of You", on August 1, 2020.

The song and music video were launched through a global press conference with the hashtag #SeasonOfYouGlobalPress trending number 1 on Twitter worldwide and in 16 other locations.

[24][25] He went on to release other singles namely "Nan Na" (ft. NiceCNX),[26] "Good Day",[27] "Thanos", written and produced by Wan Thanakrit,[28] and his first self-composed song, "Summer Fireworks".

The first single under this project is "Spaceman", produced and written by English electronic music duo HONNE.

[36] It entered the iTunes song chart in 53 locations, peaking at #1 in 21 countries, breaking Suppasit's previous record with "Spaceman".

The music video, starring Suppasit and Kim alongside Miss Universe Thailand 2021 Anchilee Scott-Kemmis, was officially launched through a press conference held at River Park, ICONSIAM on December 20, 2021.

[38] In 2022, Suppasit went on to release two more collaboration projects, namely "Forever Love", featuring South Korean R&B singer Bumkey, that was released on July 8, 2022[39] and "Turn Off The Alarm", his highly anticipated duet track with Suho, the leader of the South Korean-Chinese boy group Exo.

The release of "Turn Off The Alarm" was formally kicked off through a press conference held at Icon Siam on October 23, 2022, with Suppasit and Suho both present at the event.

[56] In September, on the occasion of the 5th anniversary of the online shopping application ThisShop, Suppasit was introduced as their new brand ambassador.

[58] In 2024, Suppasit was presented as one of the friends of The Voice Foundation, a non-profit organization that offers support to disabled, injured and abused animals.

[61] On the occasion of the 100th anniversary of its iconic Meisterstück, Suppasit has been announced as the first friend in Thailand of the German luxury goods company Montblanc.

The brand is a joint venture between Suppasit and his fiance, Tul Pakorn, alongside three other entrepreneurs: Treenat Jaiyasarn, Dissakul Prasitruangsuk (doctor) and Narikun Ketprapakorn (medical student).

[73] Suppasit, along with fiance Tul Pakorn, runs a travel vlog called Sunny sided up, where they share interesting and educational moments from their various trips around the world.