"Nobody Knows What is in My Heart," written by Tsai and performed by Shen Wen-cheng, is the song that gave Tsai Chen-nan his first big success. The tune swept Taiwan back in 1982, and people were singing it on main streets and in back alleys.
「心事誰人知」正是蔡振南的成名作。民國七十一年間，這首歌曾流行台灣的大街小巷，人人傳唱。