Theethuch Khummuang
BIOGRAPHY
Theethuch Khummuang (Thai: ธีธัช คุ้มเมือง; born 3 June 2005 in Lopburi province), nicknamed Ongsa (องศา), is a Thai actor and singer with A Entertainment. He is best known for Siwat in The Cursed Love (2025) and Prince Thinnakon in The Edge of Horizon (2026), opposite Jakkrasin Atsavatanachai, known as Inn.
He studied at the Demonstration School of Thepsatri Rajabhat University and in 2024 enrolled in the Faculty of Communication Arts at Chulalongkorn University. He was scouted by the manager and producer Suppachai Srivijit, known as A, and in 2020 he competed in The Voice Kids Thailand on PPTV HD 36, joining the team of the singer Thanakrit Panichwid (Waan). In December 2023 he released his first single, “Letter” (จดหมาย), under A Entertainment and performed at Siam Music Fest 2023.
His acting debut was a lead role. In The Cursed Love, which aired on Channel 3 from 8 October to 26 November 2025, he plays Siwat, called Sin, a young model and billionaire whose fire powers are tied to his heartbeat. Siwat sets out on a secret quest for the Heart of Divine Magic, hidden in the lost city of Tambralinga, and clashes with Khunkhao, a wind controlling mountain rescuer played by Kittipon Tippayatayarut (Au). Ongsa also sang the theme song, “The Cursed Love” (รักสาปสูญ), and the series brought him two nominations at the Thailand Y Content Awards 2025, for Best Series Soundtrack and Rising Star of the Year.
In 2026 he took the lead in The Edge of Horizon (Arun Rung), a historical boys’ love drama from The One Enterprise set against the upheaval of 1932 Siam, which ran for eleven episodes on One31 from 20 June to 29 August 2026. He plays Prince Thinnakon, born into a family of royal lineage, whose childhood bond with Phopthee, the son of the palace wet nurse, is torn apart by rank and tradition until the two meet again as adults in a kingdom on the edge of change. He sings “First Light” (แสงแรก) for the soundtrack and the duet “I Love You So Much” with Inn. With the cast he attended the series’ blessing ceremony at GMM Grammy Place on 18 June 2026 and its world premiere at Major Cineplex Ratchayothin on 21 June. His next announced project is Anantasaya: Our Love Stories.
Ongsa is a singer who walked straight into lead roles, and you can tell: both of his series let him sing the music that frames his own character. I love that his two shows could not be more different. One is a fantasy with fire powers and a lost city, the other a palace romance in 1932 Siam, and he looks at home in both. Watch his eyes in the reunion scenes of The Edge of Horizon; a lot of Thinnakon’s story is told without a word.
My suggestion: start with The Edge of Horizon for the period costumes and the slow, aching romance, then go back to The Cursed Love when you are in the mood for magic and adventure. Keep his theme songs on repeat while you wait for Anantasaya.
PROFILE DETAILS
- Native Name
- ธีธัช คุ้มเมือง
- Real Name
- Theethuch Khummuang
- Nickname
- Ongsa
- Pronouns
- he/him
- Born
- (Age 21)
- Birthplace
- Lopburi province, Thailand
- Gender
- Male
- Western Zodiac
- Gemini ♊
- Chinese Zodiac
- Rooster 🐓
- Height
- 180 cm
- Nationality
- Debut
- 2020 · The Voice Kids Thailand (2020)
- Agency / Label
- A Entertainment
- Years Active
- 2020-present
- Languages
- Thai
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