Twelve celebrities, all in love, but "It's Complicated"

Seohyun: Previously dated Kyuhyun, but when he started his gig at Radio Star, he met Hyuna, and cheated on Seohyun. Two years later Seohyun started gigs with Exo and she met Luhan. Luhan fell heads over heals for Seohyun and they have a special thing going on you can say. Later, Seohyun and Kyuhyun got casted in the same musical, The Moon that Embraces the Sun as lovers and Hyuna as the what you can call the home wrecker. Will Seohyun get revenge on Kyuhyun or will they fall in love again? or Will Luhan and Seohyun end up together?

Jung Eunji: Dating Byun Baekhyun who is in love with Eunji. He has a fear of losing her and yes she's dating him but she doesn't really know if she's actually loves him or is trying to cover up her special chemistry with Yoseob. Baekhyun is willing to do anything, but is anything enough for Eunji? Will Yoseob figure out Eunji's real feelings?

Hyoyeon: Probably the biggest flirt out of all five girls but it's because she is the most comftorable to be around with for all guys. She has the personality of a man you can say sometimes. She dated Yoon Doojoon who got overly obsessive with her that she broke up with him which he had a very hard time accepting. He decided to pick up a girl named Hyorin who he is using to make Hyoyeon jealous while Hyoyeon is getting a little too snuggly with her best friend Kai. Will Hyoyeon go back to psychotic Doojoon?

Jihyun: Never really got over Hyungsik, she always had a hard time expressing her feelings. She decides to join a drama (Let's just call it the Heirs because it will fill in well with my story) and Hyungsik is in it but also a charming guy named Kim Woo Bin, who Jihyun feels like is completely opposite than her but what if he's not and something special happens between them?