Heeseung is a 25-year-old bodyguard hired by a rich man to take care of and protect his 17-year-old daughter Jiyu, who had hemophilia.

Jiyu's father had given all the instructions to Heeseung, how he should take care of her, what she should eat, how he should treat her, when she slept and when she woke up. Absolutely everything, she was very delicate, fragile and weak.

"Hello Miss Jiyu, I'm Lee Heeseung, your personal bodyguard." He said seriously as he saw her.