Jeon Jungkook/JK Organization Boss
He may be cold, but he's warm to the heroine. He loves her, but tries not to, and is ready to give his all for her.
“Even if I become a disaster because of you, I don’t hate you. I can’t do that because I love you.”
Lee Yeo-ju/Y Organization boss's daughter.
Despite possessing a rather adept shooting ability and a cold image, she's actually a girl prone to self-harm when she's anxious. However, past incidents have left her emotionally numb, and her feelings for Jeong-guk begin to grow after meeting him.
“I can’t even feel emotions anymore.”
Park Ji-min/Y Organization Executive
He has a crush on the female protagonist and whenever she gets hurt, he brutally kills anyone who hurts her. His nickname is Jack the Murderer.
“All this love started with you, and the moment love disappeared also started with you.”
Kim Taehyung / V Organization Boss
In the past, he suffered from blood trauma because his father brutally killed the wife of the Y Organization boss in front of him. After committing a sin by killing his father and other people for the sake of the wife of the Y Organization boss who died because of his father, he goes to find the female protagonist.
“Now….I can finally rest….”
Kim Seok-jin/Health Teacher
Kim Taehyung's older brother. He was the one who could only watch as Taehyung killed their father. He fled after that day, but ten years later, upon meeting Taehyung, he approaches him in an attempt to stop his crimes.
“You are not bad, it is the environment that made you that kind of child that is sinful and evil.”
Lee Seong-gyun/Y Organization Boss
He is the father of Yeo-ju and the boss of a secret organization in South Korea, a faction known to everyone. After having his wife killed by Organization V, he strives to take good care of Yeo-ju.
“I am grateful that you were born as my daughter, and I am grateful that you saw me as a true father.”