"Nobody Knows" made Tsai's fortune. But it wasn't until the soundtrack for Wu Nien-chen's film A Borrowed Life was released that people found out that Tsai could not only compose, he could also really sing. The fact is, he began recording back in 1991.
「心事誰人知」使蔡振南一舉成名，但是在吳念真導演所拍的《多桑》電影原聲帶發行之前，大家並不知道蔡振南不僅會寫歌，還這麼會唱歌。