Season 1 of Parasitic Daughter-In-Law premiered on January 4, 2018.

Kwanjit is a singer in a restaurant, she falls in love with an American doctor. He promises to marry her and goes home to tell his relatives, but he never comes back. The young pregnant girl is heavily ridiculed by the people of her hometown, she decides to move to Bangkok, where she gives birth to her daughter Rainie. Twenty years go by and Rainie is now a young girl with curly hair and dark skin. Rainie lives in a small flat with her mother. Once Rainie finishes high school she becomes a delivery girl for her mother's papaya salad business. Rainie is often bullied and made fun of because of her dark skin. She is very interested in celebrities, especially Traikhun, the heir of an advertising company.