Fifty years ago, two grandmasters from China and Japan competed against each other, and the outcome was inconclusive. Ultimately, they decided to compile their martial arts insights into a secret manual, which sparked a storm in the martial arts community. At the end of 2019, Zhuang Hui fought hard and defeated a Japanese competitor, winning her first full-contact karate championship but suffered serious injuries in the process, paying a heavy price. In Japan, the family encountered misfortune due to the secret manual incident fifty years ago. Saori Kisaragi, who was often ostracized by her peers, trained diligently in the mountains and learned that her former rival, the senior master, had previously lost to Zhuang Hui. She resolved to challenge Zhuang in Hong Kong and uncover the mystery of the manual. The Hong Kong team announced their withdrawal from the Tokyo Olympics, which had been postponed for a year. This news hit Zhuang Hui like a thunderbolt; she felt all her years of hard work had gone to waste. Stuck in a rut, she decided to cut off all ties to karate. Jihao continued to support the dojo alone, hoping that Zhuang Hui would change her mind. During her time away from karate, Zhuang Hui became an ordinary office worker and met her boss, Darwin. Darwin's attentive care stirred something in Zhuang Hui's heart... Zhuang was notified to return to the sports institute to clear out her locker when Kisaragi visited and demanded to spar with Zhuang. Teammate Tian Ai stepped in but was easily defeated by Kisaragi's punch, leaving Zhuang intimidated by Kisaragi's fierce strength, causing her to freeze on the spot as Kisaragi left a comment for Zhuang...