Kay Lertsittichai (เค เลิศสิทธิชัย; born 12 December 1996) is a Thai actor and youtuber under GMMTV. In 2019, he graduated with a bachelor's degree from the College of Letters and Sciences at University of Wisconsin–Whitewater, majoring in Mathematics with emphasis on Actuarial Science. In 2016, Kay started making Youtube video on his channel called Kayavine and has more than 1.5 million subscribers. He made his acting debut in 2019 with a guest role in the series "Wolf" (เกมล่าเธอ).