Yun Su works for a transmigration bureau and is assigned the task of preventing villains from falling into darkness.
On her first mission, she meets the future villain as a five-year-old boy being bullied by his kindergarten classmates. She steps in to protect him, and from that moment on she ends up taking care of him. She looks after his daily life, even drying his hair for him and sending him to kindergarten every day.
Eventually, Yun Su leaves.
Years later, they meet again.
The once pitiful little boy has grown into a tall, cold, and refined man. He pulls her close by the waist, his eyes red, and tells her, “Sister, I have been waiting for you for many years.”
Yun Su has seen him at six, at eighteen, and at twenty-six. But he has only ever seen her at twenty-one.
