In 1969 Kuo returned to Taiwan and was employed as the main composer and musical consultant for Taiwan Television (TTV). That same year he wrote "No One Knows What's in My Heart" with Taiwanese songwriter Chou Tien-wang. The song won a Golden Melody Award in 1972.
1969 年郭芝苑返台後，受聘為台灣電視公司的基本作曲家及音樂顧問，同年和台灣歌謠作詞家周添旺合作，譜寫台語歌謠〈心內事無人知〉，獲得 1972 年金曲獎肯定。