Another Miss Oh

Choi Noo-ri, Hae-young's high school alumni (ep. 2–3)

Jin-sang's Monday girlfriend (ep. 14)

Hae-young (pretty)'s mother

Hero of the film "Another Productivity" (ep. 9)

Heo Ji-ya at the youth time (ep. 10)

Do-kyung's father at the youth time (ep. 10)

Lee Chan-soo, Tae-jin's friend partner.

Hae-young (pretty)'s blind date (ep. 15)

Oh Kyung-soo, the 60-year-old father of Hae-young (just). He is talented in cooking and seems to be more patient and calm than Hae-young (just)'s mother.

Oh Hae-young (pretty)

Hae-young (just)'s blind date (ep. 1)

Park Soo-kyung

Sang-seok, a sound engineer.

Chan-joo, a member of the catering division "Seasonal Table" team.

Oh Seo-hee – Hae-young (just)'s younger cousin (ep. 15)

Park Do-kyung

Oh Hae-young (just/"그냥")

Woo Hyeon – Park Soon-taek's senior (ep. 15–18)

Lawyer Gong Gi-tae (ep. 7)

Singer, worry counselor (ep. 12–18)

Lee Jin-sang, a 36-year-old lawyer who is Do-kyung's friend. He is the first person who mistook Hae-Young (just) for Hae-young (pretty) and persuaded Do-kyung to seek revenge. Jin-sang convinced to stay in Do-kyung's house for a while to protect himself from dangerous people that are related to the case he is handling. In reality, Jin-sang is hiding from the husband of a woman who recently seduced him.

Park Hoon, Do-kyung's 33-year-old younger brother who works as a sound recording studio staff. Although they have the same last name, Do-kyung and Hoon are not actually biological siblings: Do-kyung and Soo-kyung are from the maternal side, while Hoon is from the paternal side. He seems to be frustrated with his step-brother, and they do not get along with each other often and share different opinions. He always gets crazy while searching for a girlfriend.

Heo Ji-ya, Do-kyung's 63-year-old mother who works as a film producer. She is a gold digger who only cares about living a luxurious life and always asks Do-kyung for money, but never pays him back. She was against Do-kyung's marriage to Hae-young (pretty) as she knew Do-kyung would not give her money once he gets married. For this purpose, she emotionally and psychologically tortures Hae-young (pretty) into running away on the day of their wedding.

Han Tae-jin, the 36-year-old ex-fiancé of Hae-young (just) who works as an entrepreneur. He decides to call off their wedding and dumps Hae-young (just) in order to let her live happily. Not long after he dumped her, Tae-jin went to jail because of the bankruptcy. He is curious as to why Do-kyung decided to destroy his business as they never met each other previously. Even after he walks out from jail, he still has feelings for his ex-fiancé, Hae-young (just).

Hwang Deok-yi, the 57-year-old mother of Hae-young (just). She feels pressured after her daughter called off her wedding, as her friends in the neighborhood keep talking about her daughter behind her back. Deok-yi has a weird habit of taking off her clothes when she is angry.

Chairman Jang, a 74-year-old chairman and Hae-young (pretty)'s step-father, as Hae-young (pretty)'s mother was once married to him but eventually got divorced.