Oh Ara wakes up two weeks after the car accident that killed her parents.
She continues to live her life with a retrograde amnesia and attends a prestigious high school with her popular cousin and their friends. Until one day, she notices the weird...
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Hyun Seol
* An ordinary high school student who got into a car accident when she was on her way to school.
* A big fan of comic books. Loves sports.
* Has amnesia. She doesn't remember her real name or anything from her past.
* Has read 'Secret' by accident after finding the comic book on her desk before the day of the accident.
Oh Ara
* Oh Namju's only cousin.
*Was in a car accident with her parents, who didn't survive.
* Has amnesia.
* One of the main characters of 'Secret'.
* Likes one of the characters of 'Secret'.
Kim Hyeyoon as Eun Danoh
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* One of the main characters of Extraordinary You.
* Her character is a rich girl who has congenital heart disease and is the fiancee of Baek Kyung.
* Falls in love with Haru.
SF9's Rowoon as Haru
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* One of the main characters of Extraordinary You. * His character was a nameless student in Danoh's class. Danoh calls him 'Haru'. * Falls in love with Danoh.
Jung Gunjoo, Kim Youngdae, Lee Jaewook as A3 - Lee Dohwa, Oh Namju, Baek Kyung
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* Members of A3; the popular boys of Seulli High School.
* Lee Dohwa is a musical prodigy who is a big softie and a down-to-earth guy. Has a major crush on Juda.
* Oh Namju is the leader of A3 and the Seulli's the most popular student. Falls in love with Juda.
* Baek Kyung is charming, mysterious and hot-head member of A3. He is the fiancee of Danoh.
APRIL's NAEUN as Yeo Juda
* The new student of Seulli High School that got a scholarship due to her grandmother being sick. * Falls in love with Namju.
Lee Taeri as Jimmichae / Dried Squid Fairy
* One of the chefs of Seulli High School. First to be self-aware of himself.
Kim Jiin as Shin Saemi
* Danoh's best friend who has a major crush on Namju since she was little.
Kim Hyunmok as Ahn Suchul
* Danoh and Saemi's guy best friend. He likes Saemi.
