Jung Daehyun:

Jiyoung's boyfriend. He has a secret that only his family knows but he's been really secretive. He has secrets that could ruin him. If one of them spills, he will lose his love or family. He is a fun guy to be with and will always make the people around him smile. When needed to be serious he will be.

Kang JIyoung:

Daehyun's girlfriend. She wants to marry the man of her dreams. When she finds out about it, she breaksdown because everyone knew except her so she feels really stupid for falling deep for him. She is cheerful and full of aegyo but could be serious when needed to.

Choi Sulli:

One of Jiyoung's close friend but... is she really close to her? She shows more of her serious side but with enough time, she could be just as cheerful.

Jung Eun Ji:

Jiyoung's most trusted friend! Friends since... toddlers! She's a dork and very clumsy but very smart! She will be spilling the beans...

Lee HoWon (Hoya):

One of Daehyun's best friends.  He knows the secret but once the truth is told, he will feel really bad for Jiyoung and starts comforting her. His love interest is Eunji.

Kim Myungsoo:

He is extremely cold but deep down, he is very caring. He knows the secret as well but it doesn't really mean anything to him until he saw how hurt Jiyoung was. He fell for Jiyoung...