Recommendations

These dramas center on a bunch of roommates in an urban setting (there is romance, drama, comedy...)

While EW centers on a bunch of guys friends who are part of the entertainment world and who run a guesthouse, AoY and its sequel centers on a group of college going girls who room together in a nice flat.

A girl without dating experience get a kind of simulation how it feels to be courted by different types of man (or boys). The stories are only particular connected so it feels like watching little cliche scenes of romantic situations.

Both have an older femal lead falling for a younger guy, as well as the male lead being the younger brother of a friend. In both dramas the female lead knew him when he was an annoying kid and then he went abroad. Now he's back and just as annoying but hunky, handsome and cuter than a bunny. There's other similarities, but to mention them would be spoilers. Still, if you've seen What's Up Fox? you'll get them anyway.

Switching and sending your birth child to a wealthy family as the heiress and keeping the real heiress as your family. Receiving gifts and benefits from wealthy family. Wealthy family trying too hard to make you feel welcome and distancing you from your poor family.

Switching and sending your birth child in place of the real heiress to a wealthy family. Spiteful behavior of impoverished parent and receiving benefits from wealthy family.

Switching and sending your birth child to take the place of the the real child to a wealthy family. Family hardships, mistreatment and disadvantages due to poverty. Wealth and privilege power and abuse of those less fortunate.

Three sisters fight for royalty, power and pride.
Eldest sister wanted the Queen's throne.
Second eldest wanted someone that loves the main female lead.
Youngest is studious, willing to stand her ground.

Both step-siblings on these stories undergo hardships after being abandoned by their parents. With the brother always trying his hardest to protect his younger sister even when their health or life is at stake.

Twins ...exchange identities to solve the mystery and romance ....I haven’t watched When we were young ...but the synopsis sounds like this Thai drama which I watched recently...and from the trailer of Wwwy ...in acting part who are you :school 2015 ( Korean)and Khun make Sumatra Roy ( Thai) looks much better

In I saw the Devil a man is getting revenge from the serial killer who killed his wife and unborn child. In The Five a lady gets revenge from the serial killer who killed her family. Very similar plot but with different ways of getting the bad guy.

Both dramas have a character who undergoes a big trauma. Both have a dark, yet exciting story! (I highly recommend you watch them!) The protagonists end up in a similar state.
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Guy and girl gets "forced" to marry, but hate each other, and then end up falling in love.. In both series, both uncover a secret that will change their lives forever. Can they forgive each other's past and continue a happy life?

This is the prequel. I definitely reccoment watching part one, before part two because the two shows connect to one another.

— Both male leads are super smart.
— Both female leads are strong and good at their job.
— Both dramas revolve around crime and law.
— Both have funny moments that will have you laughing out loud.
— I would recommend giving hello monster a try even if you are scaptical, that drama will surprise you by how smart and well directed and acted it is.

Not really similar in the plot but the cinematography, romantice vibes, warm smiles and OSTs (important factor seriously they are all GOOD!) are some of the common traits of these dramas.
Plus, their chemistry might get you screaming!!!
Also, both male leads have careers related to arts.