In the early 20th century, Lu Cheng reached the pinnacle of martial arts and became the world's strongest. He promised his dying mother to marry the eldest daughter of a prominent family, Yu Nanyi, and vowed never to fight again after their marriage. However, the marriage was merely a formality for Yu Nanyi to appease her elders, with a three-year expiration date. Once her beloved, Li Youwei, returned after studying abroad, the marriage would end. As the three years drew to a close, Li Youwei finally returned, but Yu Nanyi realized she could no longer live without Lu Cheng.