Warkop is a comedy group comprising Wahjoe Sardono (Dono), Kasino Hadiwibowo (Kasino), Indrodjojo Kusumonegoro (Indro), Nanu Moeljono, and Rudy Badil. Dono, Kasino, Nanu, and Rudy were students at the University of Indonesia, while Indro attended Pancasila University. They initially gained popularity with the radio show Obrolan Santai di Warung Kopi, broadcast by Radio Prambors. In this show, Dono portrayed Slamet from Central Java, Kasino played various characters including Mas Bei (Javanese), Acing/Acong (Chinese), Sanwani (Betawi), and Buyung (Minang), and Indro took on roles like Mastowi (Tegal), Paijo (Purbalingga), and Ubai or Ansori. Nanu played Poltak from North Sumatra, and Rudi Badil portrayed Mr. James (Chinese) and Bang Cholil.