Theethuch Khummuang (; born 3 June 2005), nicknamed Ongsa (), is a Thai actor and singer. He is best known for his roles as Siwat in The Cursed Love (2025) and Prince Tinnakorn in The Edge of Horizon (2026). Prior to his acting career, he participated in The Voice Kids in 2020.
Early life and education Ongsa was born on 3 June 2005 in Lopburi province, Thailand. He studied at the Demonstration School of Thepsatri Rajabhat University. In 2024, he enrolled in the Faculty of Communication Arts at Chulalongkorn University.
Career 2020–2024: Career beginnings When he was fourteen, Ongsa met acting manager and producer Suppachai Srivijit (A), who was filming a video with Patcharapa Chaichua (Aum) in Lopburi. A Suppachai scouted Ongsa after seeing a video of him singing to his mother.
In 2020, Ongsa competed in the music program The Voice Kids Thailand, joining the team of singer Thanakrit Panichwid (Waan).
In December 2023, Ongsa released his first single "จดหมาย (Letter)" under A Entertainment and performed at the Siam Music Fest 2023.
2025–present: The Cursed Love and The Edge of Horizon In 2025, he made his acting debut in the lead role as Siwat in the fantasy boys' love series The Cursed Love, starring opposite Kittipon Tippayatayarut (Au). In addition to acting, he performed the series' theme song, "รักสาปสูญ (The Cursed Love)".
In 2026, he took on the lead role of Tinnakorn Varakulvathin in the historical BL drama The Edge of Horizon on One 31, starring alongside Jakkrasin Atsavatanachai (Inn).
Discography Singles As lead artist Year Title Ref. 2023 "จดหมาย (Letter)"
Soundtrack appearances Year Title Album Ref. 2025 "รักสาปสูญ (The Cursed Love)" The Cursed Love OST 2026 "แสงแรก (First Light)" The Edge of Horizon OST
Filmography Television series Year Title Role Notes Network Ref. 2025 The Cursed Love "Sin" Siwat Merton / Suriya / Peem Channel 3 Main role 2026 The Edge of Horizon Prince Tinnakorn Varakulvathin One 31
Television show Year Title Network Notes 2020 The Voice Kids Thailand PPTV HD 36 2022 แฉ Chae GMM 25 17 November 2022 2024 T-Pop Stage Show Workpoint TV 18 January 2024 2025 แฉ Chae GMM 25 13 November 2025 2026 โตมาเป็น Grow Up to Be Asok Montri Ep. 26 Oum All Access One 31 Ep. 18, 20, 23 รอบวัน Rop Wan Ep. 745 (29 June 2026), Ep. 759 (17 July 2026), Ep. 786 (27 August 2026) Spotlight 2026 Ep. 10 (4 July 2026) แฉ Chae GMM 25 17 July 2026 House 31 One 31 Ep. 3–4 Route ดังองอิน One Connection 4 Podum One 31 Ep. 38 (30 September 2026)
Awards and nominations
| rowspan="2" | 2026 | rowspan="2" | Thailand Y Content Awards 2025 | Best Series Soundtrack | "The Cursed Love"
| Rising Star of the Year
References
External links