"My revenge won't end until I wipe out every demon."
After brutally beheading the demon that murdered his parents and displaying its head, the boy 'Lee Sae' is branded a monster in his town.
With no will to live anymore, 'Lee Sae' crosses paths with 'Mong Lyeon', a Dokkaebi and a Demon Slayer, and finds a new purpose to eradicate every demon from the world.
Thus begins Lee Sae's life with Mong Lyeon.
There, Mong Lyeon discovers Lee Sae's certain 'anomaly'.
Mong Lyeon then decides to send Lee Sae to the butchers of the cultivation realm, the Ascetic Sect 'Great Martial Way'...
