Gu Yangcheon commited a lot of evil while serving the Heavenly Demon. But now Heavenly Demon was dead and Yangcheon became a prisoner of ‘Celestial Sword’ Wi Seol-Ah, the heroine who vanquished his master.

In his regrets, he answered her desperate questions, which resulted in his own death due to a curse meant to prevent any betrayal.

But then, he suddenly found himself regressed to the time of the first meeting between him and Wi Seol-Ah.

Filled with burden of his past crimes, he embarks on a new journey.