Recommendations

Similar premise, a simple high school romance which blossoms slowly but heartwarmingly, similar themes of friendship as well.

Both male protagonists started with fake love with ulterior motives then eventually ended up falling in love with the woman.

Similar in terms of the plot like the female lead gets pregnant and has the kid. And the male lead finds out later. But Autumn's Concerto has better pacing and character development.

They're both similar in the way that "justice is served". But the difference is that Kurosagi is the big scammer serving justice to other low class scammers.

Both have a lead who is secretly very good at fighting. Once word gets out about this ability, they are endlessly targeted by different groups to see who can finally beat the protagonist.

the vibe is similar because the story discuss about what truly happened in society when women don't get married

These are both family dramas and focus on marriage and different married couples. They both also have Choi Dae Chul.

Both dramas have a married couple who goes through a divorce. They both also have a couple trying to get married.

With the same main actress, the two stories similarities are mainly in the main character, all bubly and a little idiotic but full of enthousiasm !
In bith of theses dramas, the woman add trouble finding a job before settling down thanks to a good offer and then thanks to theses jobs, meet a man.
Both of theses stories talk about what happen in the past that made the main characters who they are now and we can see relationship developping with the importance of the past behind them.
Even tough the relationships and how the are growing up on each other is different both dramas have the same feeling~

Suspense is very well done in both dramas. Although in different levels, there's lots of mind games and deceiving in both.

God's Gift is more of an action drama than Mistress is but in both dramas everyone seem suspicious and there's lots of mystery and suspense.

Both involve people trying to uncover secret organizations. Also, both are revenge dramas filled with action.

In both, people are framed for crimes they didn't commit, there are lots of injustice and also a lot of action. While watching Golden Cross I kept thinking of Two Weeks.

They are very different dramas but in both the leads have to scape from a very difficult situation.

Both are time travel suspense thrillers. In God's Gift, the female lead goes back in time to save her daughter from being murdered and in Tunnel the male lead travels to the future to catch a criminal he wouldn't have been able to catch in his time.