Main Characters:

Lee Donghae: 

-Best Friends with Yoona. 
-Love to hang with His super Junior Friends.
-Nickname:Fish.
-cute
-Strong.
-likes to dance.
-Hates To see other guys around Yoona.

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Im Yoona:

-Best Friends with Donghae,Kikwang,Jonghyun & Yuri.
-Younger sister of Taecyeon
-Strong.
-Cute.
-Nickname:Yoong,Him Yoona,Deer.
-Loved to Hang with Donghae's friends and Her friends.
-Mostly friends with boys.
-Likes to dance/sing.
-Doesn't LOVE/Like Anyone.

-Can't open Her heart To another man.

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Minor Characters:
 

Goo Hara:
Donghae's 1st girlfriend and first love. She went to a job in Japan and he let go of her.

Jessica Jung: 
Donghae's 2nd Girlfriend. He loved Jessica as muched but was playing with her. She loved him ever since and never let go of him.

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Lee Seunggi:

Yoona's First Love/ Ex-boyfrined. He Brought Deppresion to yoona as he was Fooling around with others at clubs. 

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Kim Jonghyun:

Yoona's Old Friend but WILL appear later! He fell in love with her but she rejected him since yoona can never open her heart For another man.

Lee Kikwang:

Yoona's other best friend but longer that Jonghyun He loved and cared for Yoona so much and hates Donghae and Seunggi. He hates Seunggi because for making her never open her heart again .
 

Kwon Yuri:

Yoona's best friend, but loves Taecyeon she has imformed yoona she wants to date him but Taec won't accept her.

Im Taecyeon (OK Taecyeon):

Taecyeon, Best friend of Donghae. Loves Kwon Yuri but cannot accept her. Yoona's big brother who he cares and loves so much and will do anything for her. Loves to tease Yoona too.