How Can a Beauty Be so Ruthless?

He was a talented and charming man who played with power and was a demon king. He had a lifelong bond with her just because of the soul bead. He looked romantic and affectionate but was actually innocent. How could he know that she suddenly broke in and only planned to get back what belonged to him, but she had opened his heart and had already disappeared. A beauty's smile, I don't know when it became so important! When was the time when thousands of miles of mountains and rivers could not compare to that smile that was as bright as a star?