Recommendations

BOF has one main girl and 4 hot guys. (Gu Jun Pyo from BOF and Fang Ting Hao from TWG are sooo hot)... anyway you should really give this drama a try!!!

Both protagonists don't simply do their jobs for the sake of it, but more for the pride they enjoy at doing the rightful things. They go far beyond their jobs description, especially when they feel somebody has been wrongfully accused.
Both have change jobs position or location, and their arrival mark the beginning of significant changes in the company image, due to their involvement in a different case day after day.
Hanamura Daisuke is a lawyer while Hanasaki Mai is a bank employee.

Jig Jang-ui Shin is the korean remake of the japanese 2007 drama with more episodes

Both deals with north korean spies. And in both dramas the female lead has two options: either deceive her boyfriend and continue as a spy, either betray her boss and fight against the side she was.

Both have some little narration here and there by the protagonist. Have similar style of humor and the characters are flawed yet lovable.

These two dramas give you the same kind of vibe, involving: a bad female, the obsession of the male lead over his first love, framing, memory loss, stepping on your own family to get to the top and even the end gives you the same vibe. But Rooftop Prince is more a rom-com, while Innocent Man is definitely a melo-drama.

both about high school students.
Both female leads have a crush.

In both series, main protagonists can't help getting involved in others's people matters, but in a good way, they are always prompt to listen and give the best advices they can. They are so empathic toward customers or passengers problems, that they end up getting their surrounding involved to help too.
Each episode will deal with a new "challenge" or encounter with a lot of emotion and/or tears.

The two series are based on a book, (manhwa for Misaeng and novel for Du Lala's promotion) that deals with the arrival of a new employee in a big company. Both are work place related fictions.
In both dramas, our protagonists learn to adapt in a environment they are unfamiliar with, always trying to stay true to themselves beside being surrounded by people who only wish for their eviction. Both protagonists mature through their hardships, Misaeng doesn't have any romance, while Du Lala Sheng Zhi Ji have some.

Both dramas have this supernatural background (time travel vs. ability to see smells) and an amazing villain!
I was amazed by Shin Sung Rok in "You Who Came from the Stars" and I have to say that Nam Goong Min also excels in his evil role.
Both dramas are full of romance, suspense and also have many fun aspects. You will go through all kinds of emotions while watching.

Rich main guy from a popular family
Poor main girl with a good heart
Switched bride marries the main guy
Couple falling in love gradually after marriage
Perfect couple has comedy while Mask is dark

The same artistic feel. The plot is adventurous and leaves your heart and feels satisfied. Both are some of my favorite Wu Xia!!!

I really love this drama. I watched this drama over and over again. It's a family drama and the cast are all good. You can feel that they're a real family. I'm not really into a long episode drama but if you're a korean drama fan this drama is a MUST. The OST's are great. Chemistry between Lee min jung and Jung kyung ho was really amazing!!! You will laugh and cry. Get angry with the other characters but all in all it's a very very good family drama.

Oh My Ghost and Heart to Heart do not have similar plots, but they are both enjoyable to watch. The writing and directing along with the acting and chemistry worked well together to produce two wonderfully entertaining dramas. Although the plots are different, the female leads display a lovable awkwardness that subtly influences the charmingly over-confident male leads. Both dramas are definitely on my rewatch list.

The Man in the Mask is a bit more lighthearted and comedic, and less advanced than Healer (no freakily cool technologies or hacker Ahjummas) but I got the same feel with both - a main lead who has an "everyday" role where he is somewhat cowardly but transforms into an alter ego who is heroic. Both have to conceal their heroic identities from the girl that they love.