Both are office dramas about bad bosses and hard working environments. While Feel Good To Die is a fantasy genre both are comedies

both Kkondae Intern and Search: WWW are office dramas and both main leads work for the rivaling company of their former work place

the 1st ep of Kkondae Intern had the same mistreatment/bullying by the senior in the workplace as To Each His Own

both are about characters running for congress and both are kinda big fat liars that end up being supported becasue of their brutal honesty xD also both are comedies though An Honest Candidate is more of a "fantasy"

both Pop Out Boy! and W have comic characters that come out of the comic and the love story between a real person and a comic character

Pop Out Boy! and Extraordinary You involve comic characters and the "magical" way they become "real"

both had the "4-against-1 romance" while Was It Love is 4 guys 1 girl and Ex-Girlfri1end Club was 4 girls and 1 guy. plus both have Song Ji Hyo

both female leads are "uncaring" of the social norms and they say and do things that seem "weird" to other people.

both female characters are strong, independent and fashionable, and both male leads are the sweet not jerk kind
plus the directing and the vibes of the dramas feel similar and aesthetic~

Happy Old Year and Little Forest are both slow and healing. one was about cooking and one was about cleaning

Both female leads cross dress as a guy to do something unexpected from women. Though in AMA the cross dressing is a more permanent theme and the ml doesn't know about it unlike MS

Both Arsenal Military Academy and The Tale of Nokdu are cross dressing dramas done right. And both are historical genres