Shen Wenyi, a swordsman from Qiyun in the Northern Song Dynasty, chased for thousands of miles to the top of a cliff to eliminate the notorious thief "bloodthirsty demon" Zhong Xiyuan. During the decisive battle, he was suddenly struck by thunder, and when he opened his eyes, he was transported to a strange city in the 21st century. From a knight-errant in the martial arts to a "three-no" with no identity, no knowledge, and no support, she remained anonymous and studied in hiding. She relied on the top swordsmanship of the Northern Song Dynasty and the acumen and tenacity she had gained through martial arts experience, and struggled to gain a foothold in modern society. She avoided sharp edges and grew up in a low-key manner, combining ancient martial arts with modern security needs, and founded a private security company from scratch. She made counterattacks and broke through difficulties along the way, and finally built the top domestic security empire and became the formidable "Mr. Shen." Just when her career was at its peak, the company received a top-level commission. Shen Wenyi never expected that the client was actually Zhong Xiyuan, who she was chasing back then. He also traveled through time, but had long since lost the ruthlessness of the "bloodthirsty demon" and became a gentle and elegant business elite. In the past, they were enemies of life and death, and today they are the employer and the person in charge of security. In their interactions with each other, which made people laugh and cry, the two untied the past knots. Shen Wenyi finally understood that time and different worlds have changed everything, and she is still the one who persists. Qiyun swordsman at heart, but Zhong Xiyuan is no longer the evil thief he once was. In the end, these enemies who have spanned thousands of years and experienced life and death put aside the past, got married hand in hand, and started a new life.