Cheng agrees to an arranged marriage with eighteen-year-old Yoyo to please his mother and grandmother, while Yoyo sees him for his wealth. They make a deal to have no sex and to divorce in a year.
| Actor | Role |
|---|---|
 Ekin Cheng Yee-KinThirteen Cheung | Thirteen Cheung |
 Charlene Choi Chuek-YinYoyo Ma | Yoyo Ma |
 Stephanie Che Yuen-YuenMs Lau | Ms Lau |
 Bernice Liu Bik-YeeMs Lee | Ms Lee |
 Patrick Tang Kin-WangMr Lam | Mr Lam |
 Ronald Cheng Chung-KeiBruce | Bruce |
 Sandy Lam San-SanHeadmistress | Headmistress |
| MMay Lai Shun-WaiFeli | Feli |
 Richard Ng Yiu-HonProfessor | Professor |
 Teresa Lee FungThirteen's mom | Thirteen's mom |
 Mama HungThirteen's grandma | Thirteen's grandma |
 Chiu Yue-MingYoyo's mother | Yoyo's mother |
| AAneira ChoiAnna | Anna |