After his dantian shattered due to a ki rampage, So WoonHwi was abandoned by his family. Soon after, he was kidnapped by the Blood Cult and forced to live as a third-rate spy.

One day, he meets his end while searching for the legendary Secret Records of the Sword Sage. But instead of dying for good, he suddenly wakes up 10 years in the past—on the very day he was taken by the Blood Cult. This time, however, he possesses a mysterious new ability: the power to hear the voices of swords.