Joo Byung-hee (Lee Min-ki) is the crazy, free-spirited leader and vocalist of the popular underground rock group, Eye Candy. Joining him is Kwon Ji-hyuk (Sung Joon), chic Lee Hyun-soo (L), playboy Kim Ha-jin (Yoo Min-kyu), silent Jang Do-il (Lee Hyun-jae) and baby-faced Seo Kyung-jong (Kim Min-seok). When their delinquent-ridden school is forced to close down, they debate whether it's even worth returning to high school at all. However, due to an outside confrontation with their new school's current ruling band, Strawberry Fields, Eye Candy decides to attend Jungsang High out of spite so they can rule the school once again. Joo Byung-Hee finds his muse in Jungsang High School and dreams of performing in a music festival. They overcome their various economic difficulties to earn themselves the Jungsang High School uniform and finally are able to enter. By taking inspiration from his blossoming relationship, Byung-hee finally finishes his composition for the festival. Tensions flare between Eye Candy and Strawberry Fields, leading to violent encounters.
When Byung-Hee receives an apology from the members of Strawberry Fields and an offer to replace the drum kit that they had previously wrecked, he goes alone to collect the kit. The members of Strawberry Fields instead take the opportunity to attack Byung-hee and beat him with a metal rod, including giving him a serious head wound. Ji-hyuk, Hyun-soo, Ha-jin, Do-il and Kyung-jong discover the situation and reach Byung-hee, only to witness his death as he is struck by a truck as he staggers across a road to reach them.
The story of Eye Candy is forced to continue without their impulsive leader as they struggle to realise their and Byung-hee's dreams.
The automatic leader of Eye Candy after Joo Byung-hee's death.[12] He fell in love with Im Soo-ah but keeps their relationship hidden from his bandmates as he feels that he is betraying Byung-hee.[13] He was raised by his grandparents after his mother abandoned him as child.
She is the soft-spoken daughter of a wealthy businessman who's gone bankrupt. As a result, she is forced to move to a poorer neighborhood and coincidentally lives across Kwon Ji-hyuk. She receives a lot of help from him throughout her difficult times and their relationship develops. She is Yoo Seung-hoon's childhood friend, and Joo Byung-hee's muse.
Nicknamed the Ice Prince. Lee Hyun-soo tends to have a short temper and comes off as a mean guy. He spends majority of his time practicing his guitar skills while caring for his little sister.
Jang Do-il is the son of a powerful mob boss. Unlike his father, he is quiet, kind, and perhaps overly serious. Do-il keeps his private life hidden, which leads people to believe that he is very mysterious. He has a secret, one-sided crush on Bang Woo-kyung.
He is a notorious playboy and claims he joined the band in order to meet girls. Ha-jin has a crush on Kim Ye-rim, however his feelings are not reciprocated.
He claims that he joined the band in order to earn money. He is the shortest out of all the members and appears to be younger though they are all in the same grade. He is funny and kind, sometimes noisy and brings much cheer to the group. Although all the band members are close, Kyung-jong's best friend is Kim Ha-jin.
Yoo Seung-hoon is the leader and pianist of Strawberry Fields, and rival of Eye Candy. He has been friends with Im Soo-ah since childhood, and has had a crush on her for a long time. Finding it hard to accept that Soo-ah only likes him as a friend, he becomes jealous of Kwon Ji-hyuk.
The original leader of Eye Candy. He is charismatic and in the beginning, is the soul of Eye Candy. He met his demise after being hit by a truck during a fight involving Strawberry Fields and himself.[26]
Kim Jung-min as Bang Woo-kyung
A longtime friend and support to the band, she has a crush on Kwon Ji-hyuk and always sticks up for his interests even if it means blaming the rest of the band.
A solo artist at the same agency as Eye Candy. After her car almost hits Lee Hyun-soo, causing his hand to be cut by a glass shard, she develops a crush on him.[28][29][30]
Strawberry Fields' guitarist. Has a logical personality, to the point of being unfeeling.
Kim Hyun-joon as Park Pyo-joo
Strawberry Fields' bassist. He hired bodyguards to beat up Joo Byung-hee, which led to Byung-hee getting hit by a truck as he's running away. He fears revenge from the Eye Candy boys, but Yoo Seung-hoon snaps him out of it and he once again becomes a cocky jerk.
Im Soo-ah's best friend. It is hinted that she may like Yoo Seung-hoon because she keeps urging Soo-ah to date him.
--- as Lee Da-som
Lee Hyun-soo's younger sister who suffers from a serious illness. She needs constant medical attention and Hyun-soo takes on the responsibility of caring for her while their parents work during the night. She is very fond of Kwon Ji-hyuk.