Jakrapatr Kaewpanpong (Thai: จักรภัทร แก้วพันธุ์พงษ์; born 14 February 2005), nicknamed William (Thai: วิลเลี่ยม), is a Thai singer and actor. He is the main vocalist of the Thai boy band LYKN under Riser Music, formed through the GMMTV survival reality show Project Alpha (2022). Aside from his musical activities, he gained recognition through his acting debut as Thame in the television series ThamePo: Heart That Skips a Beat (2024). He is also known for playing Rome, the younger brother of Thee, in Me and Thee (2025).
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Early life and education
Jakrapatr was born as Phuwadol Kaewpanpong on 14 February 2005. Through his mother, he is of one-quarter American ancestry. He has an older half-brother from his mother side. Raised in Hat Yai, Thailand, he pursued various extracurricular activities after struggling with academics, such as playing musical instruments and practicing martial arts, eventually earning a black belt in Taekwondo.
He attended Pholwitaya School in Hat Yai for seventh through ninth grade. During this period, he developed a passion for singing after being inspired by Tom Isara's "Durian Mask" performance on the Thai television show The Mask Singer (2016). Motivated by the performance, he began practicing independently at home before receiving formal vocal lessons with his father's support. He later advanced his training by enrolling in the Young Artist Music Program (YAMP), a college prep school offered by the College of Music, Mahidol University, majoring in Musical Theater.
Prior to changing his name to Jakrapatr, he changed his birth name to Natthaphong.
Career
2020–2023: Pre-debut and Project Alpha
During his high school years, Jakrapatr was a vocalist for several student bands, including Lost & Found, Dolphin, and Broccoli. In 2022, he was selected as a trainee and contestant for GMMTV's reality competition show Project Alpha after passing a remote audition, following a recommendation from the head of his school's musical theatre department. Throughout the competition, which aired from December 2022 to March 2023, he established himself as a strong vocalist, delivering critically acclaimed covers of tracks by prominent artists such as Tilly Birds and Jeff Satur. He maintained his "Alpha" status as a top-ranking contestant throughout the competition until the finale, where he placed first overall to earn the title "King of Alpha" and secure his spot as a member and main vocalist of the Thai boy band LYKN.
2023–present: Debut with LYKN and acting career
Jakrapatr officially debuted as a member of LYKN under Riser Music, alongside Lego, Nut, Hong and Tui, with the release of their digital single "เลิกกับเขาเดี๋ยวเหงาเป็นเพื่อน (May I?)" on 5 May 2023. In addition to his activities with the group, he released the solo soundtrack "ภาพสุดท้าย (Last Twilight)" for the 2023 television series Last Twilight. The track achieved significant digital success, surpassing 30 million views on YouTube by September 2026, and earned a nomination for Best Theme Song at the 29th Asian Television Awards.
In 2024, Jakrapatr made his television debut starring as Thame, the leader of a fictional boy group named MARS, in GMMTV's musical romantic drama television series ThamePo: Heart That Skips a Beat, appearing alongside Supha Sangaworawong (Est) and his fellow LYKN bandmates. For the series's soundtrack, he contributed the solo track "5CM". In July 2025, he expanded into entrepreneurship by launching his independent clothing brand, Zaven, serving as its founder.
His on-screen partnership with Supha continued as part of the supporting cast in the romantic comedy television series Me and Thee (2025), in which Jakrapatr portrayed the role of Rome, the main lead's younger brother. Their acting partnership further continued the following year, with Jakrapatr starring in the lead role as Dean in the romantic drama series You Maniac (2026). Apart from his continuous group projects and acting roles, he officially expanded his individual discography under Riser Music by releasing the standalone single "จำได้ว่าลืม (Flashback)" on 9 July 2026.