"Technicals" like sound/light/special-effects are well and professionally made! The "Creature" i a bit rough, but expect some unexpected special effects!

Acting, plot, dialogues, script, cut and drama are also really well made! But be patient, it develops :-)

The show has some flaws, but since the good outweigh the bad profoundly, i wholeheartedly recommend this for everyone who likes:
- Quality drama and drama that addresses real and nasty issues!
- Detective-Drama-Setups
- Drama-Setups around the 1940s
- Fight-Against-Tyranny-Drama-Setups
There is also some really quite good action and actually loads of blood, but don't expect a primary horror-setup - which i am really glad for.

All scenes in the town are quite obvious made in a studio.
I got a bit irritated by that, it looks quite wrong/unreal and a bit unprofessional but i suggest:
Just ignore it 

A thriller about survival and human dignity. It tells the stories of youth who lived during a time when sovereignty and human rights were taken away from them, and they had to put their lives on the line just to achieve the most basic happiness.

Jang Tae Sang is a wealthy man of Bukchon. Rather than being interested in justice, the current reality of his life is most important to him. However, a threat appears when he encounters a woman who will completely change his life. The drama will follow that process in detail and raise the question of how to live like a human.

Netflix & TVDB:
Gyeongseong, 1945. In Seoul's grim era under colonial rule, an entrepreneur and a sleuth fight for survival and face a monster born out of human greed.

IMDB/Amazon:
In Spring 1945 in Gyeongseong, during Japanese rule over Korea, two young adults confront a strange creature born of greed, and battle against it for survival.