ok so for those who didnt watch the drama:

Sua - Ji Sunwoo (got cheated on, RICH)
Jiu - Sul Myungsook (sunwoo's colleague who's annoying as shit, eyeliner on point)
Gahyeon - Yeo Dakyung (fell in love with Tae Oh and had an affair with him, deserve a better partner)

-cont-

Siyeon - Tae Oh (white shirt, cheated on Sunwoo, lived off Sunwoo's money)
- Dakyung's mother (black shirt, dakyung's no. 1 supporter, nasal voice)
- Dakyung's father (red polo(?), wants only the best for his daughter, is actly the most sane character in my opinion)