Lee Sunny is a ruthless assassin with no heart until she met her. The person that changed her life. 

At a young age Lee Soonkyu witnessed her mother and father both get murdered right in front of her. She and her little brother were then taken away by the assassins to be trained to be like them. Now as an adult, who only knows how to kill and survive, has a long-term mission to hold up. Her mission is to take out the Park family - starting with Park Sunyoung, the heiress to Park Co.

  Lee Soonkyu ''Sunny''

  -Age: 24

  - Ruthless assassin that was trained at the age of 8

 - Quiet and easily angered

 - Only cares for her younger brother Lee Kikwang

 - Slowly develops feelings for her target.

 -Assassin for KKS

  Lee Kikwang ''Kwangie''

  -Age: 22

 -Assassin-in-training still. 

 - Quiet, but easily deceived. More outgoing then his sister.

 - Only cares about his older sister Lee Soonkyu. 

 -Slowly develops feelings for his own assassin. 

-Assassin for KKS

  Park Sunyoung ''Hyomin''

  -Age: 24

 -Heiress to Park Media; doesn't want the job. Wants to be photographer.

 -Hyperactive and Loud. Very outgoing and dorky.

 -Deeply cares about family and friends. Loves the family dog.

 - Slowly develops feelings for Lee Soonkyu, not knowing an important fact. Confused about her feelings.

 - Friends with Yang Yoseob, Jeon Hyosung, and Park Jiyeon

  Yang Yoseob ''Seobie''

 -Age: 23

 -Heir to Yang Yang Corp; doesn't want the job. Wants to be a singer.

 -Shows quality of being a leader. Very hyperactive and childish. Can be serious at times.

 -Cares about family and friends. Shows a close bond with Lee Kikwang.

 -Has a brother relationship with Kikwang after meeting him once more.

 - Friends with Park Sunyoung, Jeon Hyosung, and Park Jiyeon.

 Jeon Hyosung

 -Age: 23

 - Secret Assassin 

 - Outgoing and friendly. Typical girl. / Skilled with a knife

 - Cares about her friends who she consider family. 

 - Friends with Yang Yoseob, Park Sunyoung, Yoon Doojoon, Han Sunhwa

 - Strong dislike for the Lee siblings

 - Assassin for TS

Couples:

*Sunbyung

*Kisung

  Kiseob

  Dooseob

  Soosica

  Iuseob

  Taeny

  2hyun