When the flower of love in the modern world was about to bloom, college student Li Chengyue was affected by the spiritual power of the mysterious Qinling Mountains, causing time and space to become confused. By accident, he traveled to the Song Dynasty. He was defenseless and had nothing but a pair of underwear. He wanted to enjoy the fun of life in the Song Dynasty, but he also shouldered the mission of redressing the injustice of his mentor. Can he survive in that era? And can he escape unscathed from the overwhelming power? On the one hand, he is trapped in the intrigues of the palace, on the other hand, he is galloping on the battlefield to satisfy his grudges, and the love between a man and a woman keeps coming towards him like a huge wave. How should he make a choice?