XingBack

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

both have that secret life theme going on, and in both things were makjang crazy and the question of "how much do you truly know a person"

both Extracurricular and Derailed are similar in plot. both are about teenagers committing "crimes" that get over their heads

I personally just love female centered spy plots and both Good Casting and Part-Time Spy share those similarities~

Call of the Country has a special place in my heart, it was one of the early "uncover female" kdrama I watched and now after 10 years we get something slightly similar in Good Casting

both are female driven, funny and full of awesome female characters, plus sismance, ie totally my type of drama ;p
also both have Lee Jong Hyuk

bot The World of the Married and Misty are similar in their vibes, they have smart mature independent women, and their struggles through the makjangness of the world