Gyeongseong Creature

Not supernatural at all, but if you want to know more about Japan colonization over Korea in WWII and the consequences, Pachinko is a amazing historical drama to watch.

SEQUEL TO SEASON 1
FL REBORN
BIG TIME SKIP
SEXY ANTAGONIST POSSIBLY GETTING POWERED UP ALSO
NEW SPECIES - POTENTIAL PLOTLINE
NA PEOPLE - ANOTHER POTENTIAL PLOTLINE

Both are action-packed shows set during the Japanese occupation of Korea. Both have an enjoyable romance subplot in the mist of all the fighting and killing.
Both feature badass fighter female leads.

While 'Gyeongsag creature' is more horror themed, 'Song of bandits' has a strong western vibes.

I felt same thrilling in both drama however in G-creature, I found more horror and thrilling. Both dramas represents on Korean independence, war between Japanese and Korean.
This drama have more cruelty then bridal mask..