The 12 guys are in danger. One girl is unexpected to be the person that makes them in danger. Murder, suicide, maniac and love triangle makes the things became easy for her to seek for  a revenge. Her family murderer when she was 10 years old was fresh in her mind until she reached 18 to revenge for everything that she saw. No one know that was her until someone find out one day.

One girl that no one expect.

The 12 guys that related to the killer of her family.

Kim Yun Jae 

The young maid of Kris and Tao

Lee Eun Ji (model)

Close with Kai and Lay

Jong Yu Mi

Baekhyun sister

Romy Ahn

Sehun girlfriend but cheating with Luhan