Asia Pacific Film Festival
Ko began his career by appearing in small roles before 1965. He appeared in "The Silent Wife" later that year. In 1967, Ko starred as Feng Ze in Ching-Zue Bai's "Lonely Seventeen", for which he won his first Best Actor Award at the Asia Pacific Film Festival. In 1974, Ko starred as Zhang Zizhong in the historical film "The Everlasting Glory", which earned Ko his second Best Actor Award at the Asia Pacific Film Festival. In 1976, Ko acted in the historical film "Eight Hundred Heroes" directed by Ting Shan-hsi, playing the role of Xie Jinyuan, he won a Golden Horse Award.