In the last life, she cut off the relationship between him and her just because she was eighteen years older than him. He pursued her relentlessly. He loved her, but she loved another him. He vowed to stay with her to the death, but in exchange for her farewell.
He had been waiting for her all his life. In this life, he became her senior brother and waited silently, helping her find her soul and solving everything for her, as long as she was good.
"I said, you are the only one who can enter my heart."