Cheonmaui Husoni Doeeotda

The once up-and-coming monster hunter Suho has plateaued at B Class, dashing his hopes of ever avenging his parents' deaths. Enter the ghost of the Cheonma, former divine Murim master and Suho's direct ancestor! Fortunately for Suho, the disembodied Cheonma needs a body to hunt down his arch nemesis, the Blood Demon, and Suho is the perfect fit. Will Suho strike a deal with the Cheonma to escape his rut and gain the power to finally avenge his parents?

(Source: WEBTOONS)