Jung Minah hates Yoon Hyeri with passion. Although the two of them, along with Oh Yura, could be considered childhood friends, Minah hated how Hyeri always  about everything. Hyeri absolutely loved to piss off Minah, the two are like night and day. Minah is polite, smart and kind while Hyeri is rude, lazy and a troublemaker. All the while, Yura is Minah's best friend. She has always been protective of Minah and particularly hates it when Hyeri gets Minah's attention by annoying her. Yura is fine with Minah not having the same feelings as long as the girl doesn't have feelings for Hyeri. Minah lets everyone know that she hates Hyeri, but does she really?

Characters

Jung-Son Minah- 15. The younger daughter of Jung Eunji and Son Naeun. Minah is the 'perfect' daughter. She is smart, athletic and well-mannered, except when it comes to Hyeri. Her dream is to be an amazing doctor like the rest of her family and make them all proud.

Yoon-Park Hyeri- 15. The only daughter of Yoon Bomi and Park Chorong. The total opposite of Minah, Hyeri is fun-loving and rebellious. It's not surprising that the two do not get along well. She wants to become a movie director. Hyeri loves to remind Minah that she stole her first kiss.

Oh-Kim Yura- 16. The only daughter of Oh Hayoung and Kim Namjoo. Yura is hardworking and serious like Minah, but is also very lively and silly at times. She loves Minah, but doesn't want her to know. Yura wanted to be an artist, but has decided to pursue law instead to impress Minah. Student council president.

Jung-Son Sojin- 18. The older sister of Minah. She was adopted into the family when Minah convinced her parents to give her a sister. Sojin, like Minah, grew up to be very smart and polite. She is majoring in mechanical engineering and is very supportive of her younger sister.

Jung Eunji and Son Naeun- 38, 37. Minah and Sojin's parents. Eunji is a renowned psychologist while Naeun is a kindergarten teacher. The two of them love their daughters very dearly, Eunji is especially protective of Minah.

Minor Characters

Yoon Bomi and Park Chorong- 38, 40. Hyeri's parents. Bomi is a chief police officer and Chorong is a psychiatrist who works in the same hospital as Eunji.
Oh Hayoung and Kim Namjoo- 35, 36. Yura's parents. Hayoung is a deputy chief working under Bomi and Namjoo is a nurse in Chorong and Eunji's hospital.
Jung Jessica and Hwang Tiffany- 42, 41- Minah and Sojin's aunts. Both are doctors but working in different fields.
Kim Seolhyun- 15. Minah's friend.
Shin Hyejeong- 16. Yura's friend and vice-president
Woo Jihae- 18. Sojin's best friend.