Daemuga: Sorrow and Joy

Both involve spirits and possession, though the spirits in Revenant are a lot more dangerous, but also include conflict between living human beings.

Very different stuff but both has really good scenes with shamanism and great acting. The Guest is show and Daemuga is movie

Both has Jung Kyung Ho with long lighter coloured hair acting beside Park Sung Woong. Both WTDCYN and Daemuga has supernatural stuff going on, WTDCYN has more fantasy freatures and less shamanism than Daemuga and also is a show not a movie. In WTDCYN Jung Kyung Ho's character is (morally gray?) protagonist unlike Daemuga where he's the main villain.