Hsieh Ho-hsien (Chinese: 謝和弦; pinyin: Xiè Héxián; Pe̍h-ōe-jī: Siā Hô-hiân, known professionally as R.Chord, and sometimes A Chord; born 15 April 1987) is a Taiwanese singer and actor. A Chord is known mainly for writing the lyrics of the song, "Gou Ai," which was played on the Taiwanese drama, The X-Family. "Gou Ai" was also performed on K.O.3an Guo by Pets Tseng. The song has also been parodied multiple times on K.O.3an Guo.