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I will say if you liked My Fuxxxxx Romance, you will be sucked into Friend Zone and invested. Friend Zone has the love triangles, but it is WAY MORE TWISTED! Just a warning that there's a lot of cheating and explicit content. It also has BL relationships if you were interested in that too. I will say, if you watch the first season, you need to watch the second season.

they're both realistic and have a natural paced love/slice of life plot. also, the leads in both dramas are studying at university. the only difference i'd say is that the leads in unrequited love knew each other before in middle school, but apart from that, the dramas have a similar vibe

both dramas give a healing, peaceful vibe.
both have nice countryside locations.
in both dramas leads were connected since childhood.

the characters are in university in put your head on my shoulder, but i found the dramas to be pretty similar despite this.
they both have the male lead and female lead living together facing the hardships of their jobs/school life, and fall in love at a realistic pace despite not really hitting it off at first.
i think the main similarity is that both of these dramas are realistic and actually have a natural pace to them, they're both quite simple and pretty much just follow the main leads' daily lives whether they're at work, university or living together. but, i think that's what makes both of them stand out in the kdrama/cdrama world. it's refreshing to not have any annoying drama tropes and just a natural, realistic slice of life and romance mix.
i would say because this is my first life is more mature than put your head on my shoulder tho, if thats an issue to you.

Though very different in some aspects, some themes and the protagonists' characters felt very similar to me.

- both stories highly revolve around royal politics
- both stories' romance is linked with the royal families
- both protagonists come from outside the palace but come to play a huge part in it
- both protagonists are smart, strategical thinkers and often way ahead on what steps others take
- both stories shed light on thoughts about their origins, be it their ethnicity or family, and what that means to them

It gives me a similar vibe to the mouse in how both of the main leads are very similar in many ways.

The village and the gangs in the village who cause trouble and everything kind of gave me DOTS vibes, if you love A Tale Of A Thousand Stars, DOTS is a must watch.

Both is about a commoner rising to power and being loyal to only one woman.
Qing Qing Zi Jin, the male lead is an intelligent bandit leader while in Royal Highness the male lead is only a commoner scholar.
Both the dramas female lead only see the male lead and support to the end.
No Second Main lead syndrome (Lucky for that)
*There are a lot of similarities don't wanna put spoilers though.

They have similar vibe. If you liked Cambrian Period then you will like City Hunter as well..........
Do watch.

Both have fleshed out female protagonists who are not reliant on men; if a damsel is in distress another damsel will help her. Although Kakekomi is historical they share some similar themes

-Have an eccentric lead
-Both series have a character that specialize in almost everything
-Both series feature a senior that always suppress their junior (in a funny way)

Both main protagonists suffering from cancer can make contract with "devil" to get extra time to life. In If Cats Disappeared From the World can postman erase one thing from the world and then get extra day to life. In Doom at Your Service Tak Dong Kyung makes a contract with Myeol Mang for a hundred days to live how she wants, risking her everything.

both are adaptions of the same story.

Both are adaptions of the same story.

ITSAY also has a boy who is not sure about his feelings while the other boy is very open about his.