Inhuman Kiss is a Thai supernatural horror movie with a bit of a tragic love story to boot.
Set in rural Thailand of the 1940s, it tells the story of a young woman who is a regular girl by day but unwittingly turns into a demon called a krasue at night, having no memory of her activities the next morning.
While the Netflix description could be interpreted as a supernatural romantic comedy, it's definitely not - Inhuman Kiss has a serious tone and is a bit gory to boot. Its dramatic depth seems a bit shallow but it's an engrossing and enjoyable watch and it has high quality special effects.
I would link the YouTube preview but it gives away too much and it's much more enjoyable to go in without knowing too many specifics.
Available on Netflix!