Recommendations

Almost the same plot: a poor girl is employed by a rich guy who wants to find a successor between his adopted sons

First off can I say, I'm surprised no one mentioned this one. There is Galileo 2 but I never watched b/c Utsumi wasn't the lead.

This is a perfect example. Nanba (Hard Nut) is a student at Tokyo University for Mathematics. Yukawa (Galileo) is an assistant physics professor at Tokyo University. You'll notice the same campus scenes.

Tomoda (Hard Nut) is a straitlaced police detective presented with cases that need a mathematical need---leading to predictions on the killer. While, Utsumi (Galileo) is a straitlaced police detective presented with cases that need a physics understanding in order to predict the killer.

One glaring difference. Nanba is far more excited by the crimes while Fukawa is snobbish & void of any excitement. Tomoda is a bit more concerned for justice while Utsumi is highly sensitive for each crime.

Slight flirtation is found in both shows---well in Hard Nut it's one sided; in Galileo, it's clearly reciprocated.

If you liked or loved Hard Nut then you'll love Galileo and vice versa. This versio is basically, as I said before, is the same story but with a younger pair in Hard Nut with an interesting approach. You'll love it.

Both are about succesful, single working women in their 30s. They have a very similar vibe...The director of In Time With You was also part of creating The Pursuit of Happiness.

This drama is so wonderful. It was my first drama with Ryu Jun Yeol and .... he is so amazing and full of charms :3 ! I really fell in a deep love with him <3 . Hwang Jung Eum like always is stunning, it's because of her that i think that this drama is similar to She Was Pretty. She brought this atmosphere. Like 94loveKdrama said the loveline give you butterflies in your stomach.

I dont know why but the end was a little bit disappointing, i means i really loved the ending it was what I wanted but ... i feel like i was a little bit neglect

But I recommend this drama to everyone , i'm serious ! Please watch it ! ^^

very similar, but not so much that its the same story. they both include "villains" who want to bring justice to the world by taking out those who the law cannot touch or has not gotten to. leaves the audience to question who really is in the wrong, and leads them to sympathize with the "enemy" so to speak

yokokuhan is a little more tame than brain man is in regards to violence and blood and stuff. i would also say brain man is 10 times more suspenseful but thats just me. aside from this they are both very good! (and ikuta toma is in both, coincidentally) if you liked this i recommend brain man!

Four hot guys and a girl living together under the same roof.
Romance
Humor
Friendship

Same level of weirdness - what sums up both movies well. Otakus might have higher quality and be more theatrical while Quiet Room has a story to tell.

Both female leads are doctors with similar personality types. They both get transported to another realm/time period. While Faith is more of a medical drama and sageuk, W is more of a modern day romantic comedy.

Both are reverse harem themed dramas, where a girl ends up living with three brothers in the same house.

They both have this dark and sad aura and kind of forbidden relationships.

Raw love. Hot leads. Both give me a similar not exact tone. Both leads go nonstop for their love. Amazing.

Both are about college students:

In a Good Way - centers around a main couple and their college life

Age of Youth - AMAZINGG!! It talks about 5 young women who live together for college, and shows the development of their friendship from strangers who tolerated each other to the best of friends, along with the experiences each character goes through. IMO, I loved Age of Youth more because it also touched based on dark themes, and showed different personalities.

Both are about a mother trying to save their child from a kidnapper...

Both excellent historical drama. I think Nirvana might be even better. It is more political intrigue but made very interesting. I love the strong female characters in Nirvana.

Both have time travelling element. Scarlet heart is one of the excellent historical C-drama. Perfection from all cast, writer.