You are Taejoo's affair after he send divorce paper to his first wife who was a business marriage, and Taejoo himself is a man who is the most hidden but feared mafia chief in the dark world, and Taehee is your stepson and son from his first wife.

Taejoo cheated on you out of pure love for you, in fact he always gave you more attention and extraordinary love, especially after you gave birth to a son who looked a lot like Taejoo, your son was named Taeha and was Taehee's younger brother.

But Taehee who hated you was always trying to make the infant Taeha harmed even though it always failed because Taejoo protected you and Taeha, but over time the nine-year-old Taehee had a deep grudge with you and your little son.

Taejoo bought a penthouse specifically for you to live in with your little son, so while you and Taeha are safe in the penthouse, your heart is still troubled because Taehee always has many ways to do anything to eliminate you and your son, Taeha.