Prachaya Ruangroj, known professionally as Singto, is a Thai actor. He is well known in Thailand for his role as Kongphop in SOTUS: The Series released in 2016.

SOTUS: The Series is a 2016–2017 Thai television series starring Perawat Sangpotirat (Krist) and Prachaya Ruangroj (Singto). It is an adaptation of the novel SOTUS: พี่ว้ากตัวร้ายกับนายปีหนึ่ง by Bittersweet. The title SOTUS refers to the S.O.T.U.S. system which Kongphop and his fellow freshmen have to undergo to be recognized by the hazing team, led by third-year student Arthit, as their official junior students. As the activities unfold, the two groups go through a series of conflicts and reconciling, and the friendship and love among them gradually flourish.