| Cast | Role | Description |
| Ha Yu | Shum Yat-On 沈逸安 |
Chinese Writer Suen Man-Yee's husband. Shum Yat-Sum and Shum Yat-Yin's father. |
| Liza Wang | Suen Man-Yee 孫敏儀 |
Lawyer Shum Yat-On's wife. Shum Yat-Sum and Shum Yat-Yin's mother. Yuen Sai-Hei's god-mother. |
| Patricia Liu | Shum Yat-Sum (Natalie) 沈一心 |
Lawyer Suen Man-Yee and Shum Yat-On's daughter. Hung Ji-Dat's ex-wife. Shum Yat-Yin's older sister. Yuen Sai-Hei's lover. |
| Wayne Lai | Hung Ji-Dat (Raymond) 熊志達 |
Lawyer Shum Yat-Shum's ex-husband. |
| Marco Ngai | Yuen Sai-Hei (Keith) 阮世晞 |
Lawyer Suen Man-Yee's god-son. Shum Yat-Sum's lover. |
| Myolie Wu | Shum Yat-Yin 沈一言 |
Law Student Suen Man-Yee and Shum Yat-On's daughter. Shum Yat-Sum's younger sister. Ching Hok-Kan's girlfriend. |
| Sammul Chan | Ching Hok-Kan (Dick) 程學勤 |
Lawyer Shum Yat-Yin's boyfriend. |
| Lee Shing-Cheung | Shum Ji-Wah (Peter) 沈志華 |
Shum Yat-On's younger brother. |
| Nancy Wu | Cheung Lai-Kei 張麗琪 |
Shum Yat-Yin's friend. |
| Kate Tsui | Ada | Psychologist Ching Hok-Kan's friend. |
| Akina Hong (康華) | Yuen Ka-Wai 袁嘉蕙 |
Hung Ji-Dat's friend. |
| Charmaine Li | Betty |
Read more about this topic: When Rules Turn Loose
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