Gems Kantapat Dewitpattanapong
BIOGRAPHY
Gems Kantapat Dewitpattanapong (Thai: เจ็ม กันตพัฒน์ เตวิชพัฒนพงศ์; born January 2, 2004) is a Thai actor and model signed to Domundi TV. He plays Lantao in Your Third (2026), in a career that began with a four-episode guest part in 2023.
He was born in Lampang, in northern Thailand, and has been studying for a bachelor’s degree in automotive engineering at Lampang Technical College alongside the acting. Domundi announced him in late 2023, and his early credits sit inside the company’s own productions and reality output.
His debut was a guest role as Thames in Naughty Babe (2023), four episodes. DMD Friendship The Reality followed the same year, running to six episodes with a further guest appearance in 2024, and the Japanese programme Sawatdee Khrap T-Boys!! gave him ten episodes in 2024 as part of a group profile of Thai performers.
His first substantial acting role came in July 2024 with Battle of the Writers, where he played Ozone across twelve episodes. Your Sky in 2025 gave him two separate single-episode credits, and Love Upon a Time in April 2026 five episodes as A Chai. Your Third, at twelve episodes, matches his longest run.
Laid side by side, his first four credits run four, six, ten and twelve episodes. The shift from reality and guest appearances to a scripted twelve-episode part came in the summer of 2024.
He is credited under two names. Kantapat Dewitpattanapong is the current one, and Jassada Janmano appears on older credits. His social handles changed to match the newer name, from gems.jsd to gems.ktp.
Four, Six, Ten, Twelve: Counting Up
Gems is a fun one to follow because you can literally count his rise. Four episodes as Thames in Naughty Babe, six on DMD Friendship The Reality, ten on the Japanese programme Sawatdee Khrap T-Boys!!, then twelve as Ozone in Battle of the Writers. And all of it while working on an automotive engineering degree at Lampang Technical College. Lines in one hand, engine manual in the other? Respect.
Ozone First, Lantao Next
For his first substantial scripted role, start with Battle of the Writers (July 2024), twelve episodes as Ozone. Then go to Your Third (2026), where he plays Lantao, also across twelve episodes, on GMM25 and iQIYI, directed by Thanamin Wongskulphat from Laila’s novel. For a bonus round, Your Sky (2025) has him in two different single-episode parts, so keep your eyes open.
A Domundi Original Through and Through
His most reliable pairing so far is with his own agency. Domundi TV announced him in late 2023, his debut in Naughty Babe and the DMD Friendship The Reality run both came through the company, and Domundi is one of the three producers of Your Third, alongside Mandee Work and Copy A Bangkok. Even his handles matched the new name, switching from gems.jsd to gems.ktp. Brand consistency: achieved.
PROFILE DETAILS
- Native Name
- เจ็ม กันตพัฒน์ เตวิชพัฒนพงศ์
- Real Name
- Kantapat Dewitpattanapong
- Former / Birth Name
- Jassada Janmano (เจษฎา จันทร์มะโน), the name he was credited under until around 2024
- Nickname
- Gems (เจ็ม)
- Pronouns
- he/him
- Born
- (Age 22)
- Birthplace
- Lampang, Thailand
- Gender
- Male
- Western Zodiac
- Capricorn ♑
- Chinese Zodiac
- Goat 🐐
- Nationality
- Debut
- 2023 · Naughty Babe (2023) as Thames
- Agency / Label
- Domundi TV (current, since 2023)
- Years Active
- 2023-present
- Languages
- Thai (native)
- Skills
- Acting, Modelling
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