HONG FAMILY
1. Mom - Hong Chae-won
2. Dad - Hong Byung-joon (divorced)
3. Sister - Hong Eun-hye
4. FL - Hong Shu-hwa
CHOI FAMILY
1. Hong sister's father - Choi Byung-joon
PARK FAMILY
1. Grandma - Park Jang-mi
2. Grandpa - Park Il-sung
3. Mom - Park Hye-rim
4. Dad - Park Hyun-seok
5. ML - Park Min-jae
The list is not finished as the number of characters can possibly grow as the story goes on!