Ivy Ling Po was at the height of her fame in traditional Huangmei Opera films -- and chiefly as a male impersonator -- when she radically changed her image, taking on an ultra-contemporary semi-musical role in Song Of Tomorrow. Ivy plays a dance hostess and leading man Chiao Chuang is a jazz drummer, but with a difference. Chiao is a heroin addict, and Ivy learns that heroin is a far more lethal adversary than "the other woman" when trying to keep their marriage intact.
| Actor | Role |
|---|---|
 Ivy Ling PoSu Ling | Su Ling |
 Kiu ChongJiang Song Ping | Jiang Song Ping |
 Chin HanYu Ming | Yu Ming |
 Shen YiBai Lu | Bai Lu |
 Lui MingDavid Zhu | David Zhu |
 Chen Hung-LiehXiao Ding | Xiao Ding |
 Tien ShunManager Chan | Manager Chan |
 Ma Hsiao-NungLing's mother | Ling's mother |
 Wei Ping-AoTV host | TV host |
 Erh ChunTV crew | TV crew |
 Tsang Choh-LamBartender | Bartender |
 Chiu Sam-YinNightclub dancer | Nightclub dancer |
 Violet Pan Ying-ZiNightclub dancer | Nightclub dancer |
| CChu FangNot listed | Not listed |
| FFong YueNot listed | Not listed |
 Chu GamNight club extra | Night club extra |
 Helen Ma Hoi-LunNight club extra | Night club extra |
 Gam Tin-ChueDrug rehab. hospital principal | Drug rehab. hospital principal |
 Lau ChunPing's friend | Ping's friend |
 Lee HoNight club extra | Night club extra |