This is a very mini-drama with a duration of 5 minutes and 3 minutes credit title, lol.
It's kinda hard to agree with the "urban legend" premise because all the stories are just only about a ghost killing people.

I think it's better to inform the viewer about the legend. For example, if I wants to tell the story about "Bloody Mary", I will create a situation where the casts cast the "Bloody Mary 3x" spell in front of the mirror to summon the ghost. There's an Indonesian movie named "Dongeng Mistis" which contained 6 mini-stories of Indonesia's urban ghost stories..., and in my opinion, Dongeng Mistis is way better than Goedam.

The acting was OK, the actress at episode 1 kinda sucks because she is more likely to looks anxious rather than scared. The make-up effect was OK to poor, the CGI.... just no-no. From episode 1 - 4, no further information on why the ghost appears or even the no name of the ghost was informed (if the show meant to introduce Korean types of ghosts).
From Episode 5, the story writing surprisingly better, as if it changed the writer. Though from episode 4 each were titled, it still does not connect with the story, but quite well-explained.
At the bottom line, this is just a mini-story of a ghost killing people and end. All the situations left hanging unexplained.

Overall, this one still OK to watch if you have 10 minutes spare times and doesn't know what to do with it