This is the manhwa version of Dan Da Dan. I have watched the anime adaption of Dan Da Dan, and this manhwa has similar vibes.
We have an action-adventure where ML & FL fighting off the supernatural with some comedy & romance to top it off. There are some emotional/heart wrenching scenes, just like in Dan Da Dan. (The type of humor is significantly different where there are no type of jokes about bananas and what not in the Legend of Dangun.)
It is a fun manhwa, and if you don’t like it after the first chapter, give it a few more and I’m sure you will be hooked.