Born in Pematang Siantar. Education : HIS, SLA, ATNI. Real name: Mangasa Pandapotan Sitorus. Prior to the film, Masito was known as a boxer, then a tap dancer. Plunge into film as a supporting actor in the films "Surja" (1951), then "Kafedo" (1953), "Putri from Medan" (1954), "Disimpang Djalan" (1955), "Djuara 1960" (1956), "Tandjung Katung" (1957), "Virgin Child in the Host's Nest" (1962), "Between East and West" (1963), " ..... and Flowers Fall" (1970), "Only One Way" (1972) , "Last Tango in Jakarta" (1973), "A Thousand Memories" (1975), "Ali Topan Street Children" (1977), "Martini" (1978) and others. Has worked as a journalist at SKM Dunia Film. Masito has never had the chance to play a major role. In "Jakarta, Jakarta" (1977) he won Citra as the best supporting actor at the 1978 FFI in Ujung Pandang. As a freedom fighter, he received the Satya Badge, the Guerrilla Star.