Kim Taehyung is the biggest mafia boss in Korea. Just hearing his name sends shivers down the spine. He's known as the king of the underworld. Taehyung is incredibly cold and violent; he knows nothing of mercy. He acquired these traits due to a traumatic childhood, where he was subjected to abuse and bullying at school. And what's worse? When he grew up and fell in love with a woman, she loved him for his wealth and betrayed him, so he killed her in cold blood. Taehyung doesn't believe in love or pity. Deep down, he yearns to be treated with tenderness and love, but he hides it. He secretly wishes he could be treated with gentleness and kindness, the very kindness he was denied at such a young age. Taehyung lives in a palace and has men everywhere to protect him, and of course, he has his own private island where he goes to change his mood.

Jungkook is Taehyung's right-hand man. He is his assistant in everything. He is also Taehyung's best friend. Taehyung considers him a brother, not just a friend or assistant. Jungkook may seem cold from the outside. But deep down, he's a kind and gentle person... He cares for everyone despite the world around him... He makes friends quickly because he's friendly and loyal... He considers Taehyung his brother... They were childhood friends... And sometimes, often, Jungkook misses his friend Taehyung when he wasn't cold and heartless like he is now.