KIM MYUNGSOO / L

Myung Soo, mainly known as L, is a 18 years old well known playboy in the campus. He is also the son of the chairman of Woolim College, the college that both Yoona and himself attend. He is in a group called Infinite, which they named so themselves. Infinite is the most popular boys group in Woolim College, which can also be known as the kingkas. He is wanted by every single girl because of his extremely cool personality and look, except for Yoona. This gets L furious and starts following her everywhere she goes, but this causes Yoona to be bullied by L's fangirls. Despite of that, L is very protective and will always be there when Yoona needs him. Soon, he falls in love with her and they started dating and even got engaged. But one day, Yoona went missing and everyone assumes that she is dead. This news causes L to a great deppression and he shuns everyone out of his life and never believed in love again. 

CHOI SIWON

Siwon is 19 years old and the heir of Choi Corperation. He studied in London and on the day he came back to Korea, he got into an accident and met Yoona. What will happen between them?

HAN EUNJUNG

Eunjung is 18 years old and everyone believes that she has crush on L since the day she is born. She is the member of T-ara, another popular girls group in Woolim College. She never liked Yoona and is always trying to get rid of her as Yoona is getting closer to L. She is always nice and kind in front of L but when L is not around, her whole personality changes. 

GIRLS' GENERATION

The queenkas of Woolim College. Consists of Taeyeon (the dorky leader), Sooyoung (the tallest member), Jessica (American-born-Korean), Sunny (the fake-maknae), Seohyun (charismatic maknae), Tiffany (another American-born-Korean), Yuri (the black pearl), Hyoyeon (the dancing machine) and lastly, Yoona (the sparkling modest girl).

INFINITE

The kingkas of Woolim College. Consist of Sungkyu (the annoying leader), Dongwoo (y playboy), Hoya (the muscular one), Sungyeol (charismatic quiet guy), Woohyun (angelic voice), Sungjong (the maknae leader) and lastly, L (the coolest guy that can freeze you).