From the start, he transmigrates into the body of a dying, sickly disciple of the Carefree Sect. His constitution is so poor he can't practice martial arts, and the terminal illness from his previous life means he won't live past twenty. Gu Qiubai binds himself to the heaven-defying comprehension System. One look at a sword manual, and he deduces an ultimate technique. In a single day, he comprehends a sword move that uses poison to counter poison and prolong his life. Carefree Master emerges from seclusion: "Where did you learn this sword technique?" Gu Qiubai coughs up blood and grins. "I came up with it myself. Want to learn?"