Kay Lertsittichai

An actuarial science degree is not the usual way into a vampire series, and yet here we are. Kay Lertsittichai finished a mathematics degree with an emphasis on actuarial science at the University of Wisconsin-Whitewater in 2019, and in 2025 he played Jett in Revamp The Undead Story. Kay Lertsittichai (เค เลิศสิทธิชัย) was born on 12 December 1996 in Nakhon Pathom, Thailand. He also goes by Kayavine, the name of the YouTube channel he started in 2016.

The channel came before the acting. Kayavine mixes reviews, vlogs and reaction videos, and it passed one million subscribers in December 2020; by January 2025 it had 1.55 million subscribers. His school years included Sukhondheerawidh School and time as an international exchange student at Guilford High School in Illinois, in the United States.

His first screen credit was Koji, a guest role in Wolf (2019). A year later GMMTV gave him a main role as Gunkan, called Gun, in Who Are You (2020), and in 2021 he played Amornthep in 55:15 Never Too Late and Win in the film Deep. 2022 brought Talay, full name Mahasamut Komolpetch, in four episodes of F4 Thailand: Boys Over Flowers, Got in the third story of Good Old Days, called Road to Regret, and Q in School Tales The Series: 7AM.

In 2023 he took two main roles: Hugo in the suspense series Home School and Mac in Wednesday Club. He played Ken, full name Kasidit, in High School Frenemy (2024) and dropped into episode 5 of Break Up Service (2025) as Jang. Then came Jett in Revamp The Undead Story, one of the supporting players around the vampire Ramil and the shop owner Punn. In 2026 he played Jee in Love You Teacher and Phu in Moonshadow, and he is part of the cast of Starscope.