Main •
Im Soo-hyang as Kang Mi-rae •
Jeon Min-seo as young Kang Mi-rae :A timid and insecure girl who has low self-esteem due to her "ugly" appearance. She desires to live a "normal" life and does not like standing out. After being bullied throughout her middle school and high school, she finally decides to undergo cosmetic surgery prior to starting college. As she enters the university, she starts to feel the pressure of being "beautiful" and "popular" among her peers. She aspires to be a
perfumer. A student of Chemistry Department of
Korea University Class of 2018. •
Cha Eun-woo as Do Kyung-seok •
Shin Jun-seop as young Do Kyung-seok •
Moon Woo-jin as child Do Kyung-seok :A handsome college student who possesses both intelligence and wealth, but secretly harbors emotional scars from his unhappy home environment. He is indifferent about what others think, thus appearing cold and distant; however, he does have a caring side within him. In particular, he does not care about beauty or physical appearances despite being praised for his good looks. A student of Chemistry Department of Korea University Class of 2018. •
Jo Woo-ri as Hyun Soo-ah • Lee Chae-yun as young Hyun Soo-ah :The most popular girl in the chemistry department for her extraordinary natural beauty. She appears pure and kind, but the underlying motives of her actions eventually prove otherwise. She craves attention and adoration, attempting to attain it (or, at times, steal it) with her gentle and innocent persona as she cannot accept the potential for anyone to love other girls more than they admire her. A student of Chemistry Department of Korea University Class of 2018. •
Kwak Dong-yeon as Yeon Woo-young :A chemistry graduate and teaching assistant in the chemistry department. He is also Do Kyung-seok's housemate later on. He is popular among the students for his handsome appearance and also his friendly and polite persona. He falls for Kang Mi-rae for her looks but grows to love her personality as they both share their expertise in perfumes.
Supporting People around Kang Mi-rae •
Woo Hyun as Kang Tae-sik :A childhood friend of Kang Mi-rae. A first-year psychology student in Korea University who dreams of being a hip-hop musician. She has a crush on Yeon Woo-young.
People around Do Kyung-seok •
Park Joo-mi as Na Hye-sung :Do Kyung-seok's mother and CEO of a perfume company. Due to a traumatic fight, she loses her sense of smell and later gets divorce from the abusive marriage, she has been separated from her children for years, until she met her son again through Kang Mi-rae. • Park Sung-geun as Do Sang-won :Do Kyung-seok's 17-year-old sister and an internet broadcasting jockey. •
Lee Tae-sun as Woo-jin :Do Kyung-seok's childhood friend and a bar owner.
Chemistry students •
Park Yoo-na as Yoo Eun :The freshmen (Class of 2018) representative. Her chic personality makes her popular among the students. She has an innate sense of fairness and takes no sides in any conflict. She encounters Soo-ah in her neighborhood and starts questioning her actual family background. • Jung Seung-hye as Choi Jung-boon :A freshman. A cheerful girl from
Busan with a strong accent. She has a crush on Woo-jin. • Jung Hye-rin as Lee Ji-hyo :A freshman who is close friends with Soo-ah. Considered as the prettiest in her class after Soo-ah and Mi-rae. She is self-conscious about her physical appearance and what people think of her. • Kim Doh-yon as Jang Won-ho :A freshman. He has a crush on Soo-ah, and treats Kyung-seok as his biggest rival. • Kim Eun-soo as Kim Sung-woon :A freshman and Jung Won-ho's best friend. •
Oh Hee-joon as Kim Chan-woo :A student from Class of 2013. He is in his third year of repeat studies. He is known as "Master Dog" due to his crude personality. He bullies Mi-rae after she rejected his confession, and develops a crush on Soo-ah. He later gets beat up by Kyung-seok for bullying Mi-rae while Woo-young threatens to ruin his future if he ever does it again. • Ryu Ki-san as Goo Tae-young :A second-year student. President of the student council. He has an indecisive personality and wavers in his decision to date Tae-hee. • Baek Soo-min as Go Ye-na :A sophomore. A student council member in charge of student affairs. She used to be the most popular girl of the Chemistry Department till Soo-ah came along. She has a crush on Kyung-seok, but later develops feelings for Jung-ho. •
Bae Da-bin as Kwon Yoon-byul :The representative of the sophomores (Class of 2017). Vice president of the student council. She is decisive and responsible, with an honest and blunt personality. Because of her boyish looks, she is popular among women. She later develops a crush on Woo-young, but is rejected. • Lee Ye-rim as Kim Tae-hee :A sophomore. She is the secretary of the student council. She feels insecure due to her plump body. She likes Tae-young. •
Choi Sung-won as Song Jung-ho :A sophomore. He is a mood maker. He has a crush on Ye-na since the first year. He joins the army after his sophomore year. •
Seo Ji-hye as Noh Min-a :A sophomore who likes to gossip. • Kim Il-rin as Yeo-woo :The representative of the third year students (Class of 2016). A superficial person who only cares about physical appearances. •
Ham Sung-min as Jung Dong-won :A freshman. He is a motae solo and otaku with a huge presence on the Internet community. He is deluded that Soo-ah likes him. • Kim Min-ha as Sun-mi :A second-year student. She has a great relationship with the juniors.
Others • Jung Myung-hoon as Young-mo :Chief of the National Assembly and Do Sang-won's assistant. • Ji Sang-hyuk as Lee Soo-hyun :Business director of the cosmetics company operated by Nae-seong. • Ha Kyung as Yong Chul :Mi-rae's middle school crush who brutally rejected her, mostly due to her physical appearance. •
Yoo In-soo as Park Rae-sun • Cha Bo-sung as Ye Joon, a freshman (Ep. 2-3)
Special appearances •
Lee Young-ae •
Um Hong-gil • Ahn Sang-tae as Taxi passenger •
Junoflo • Jeon Jin-ki as Priest •
Yoon Bo-ra •
Tiger JK •
Bizzy •
Han Hyun-min •
Abhishek Gupta ==Production==