Recommendations

Both dramas are supernatural romances. In "Secret Garden" main leads are swapping their bodies. In "Dear Prince" main female lead is able to see a male's soul and sometimes is possesed by him. In both dramas supernatural events create funny situations and some problems, but in the end main leads fall in love with each other.

They both share the psychological and abuse tags and are very dark on those themes, Silenced seems a bit darker since we are dealing with children abuse, Traces of Sin has child abuse as well, even if it is not as explicit, however there is abuse towards the intellectually impaired. Definitely worth the watch for those that enjoyed Silenced.

Comedic take on human-alien/zombie encounter, where the aliens/zombies come across as sad and pathetic rather than menacing.

The male lead has to pretend everything is allright so he can lead the company.
The male lead is cute and nice.
No robots though.

The japanese drama is similar to this movie where a 65 year old woman feels like she lost her youth while taking care of her family, she suddenly becomes a 20 year old for a day, but goes back to herself at midnight, and lives her life as a youth again.

I do not think that the story is similar...just the robot theme is what makes them the "same".
I think another similarity would be that both female leads loved their robot boyfriends like a human male. The robot boyfriends are both caring, handsome and dreamy as well...Like, both actors who played the roles have a perfect body and face. And the attitudes towards the female lead is very superb as well. Makes you want to ask where you can buy such "robots"...

These two dramas are pretty intense. The leads are desperate to save their loved ones. Both shows are filled with investigation and mystery.

Both dramas are pretty intense. A feeling of urgency is present in both as characters fight against time. Both shows are filled with mystery and investigation. Also, both leads have the same vibe.

Both shows deal with extreme situations where characters must find a way of surviving and saving people they care for...

In both shows the leads, while trying to save people they love, end up finding something they weren't expecting... Both are suspense thrillers with badass protagonists.

I think that when "On the Way to the Airport" was showing, its competitor drama was this, My Wife is having an affair this week...You know how korean dramas have a trend or a theme at a certain time (like time travel or robots or aliens)...
Anyway, they both have the same theme in a way,..Cheating or looking for other options of already married people...But it was kind of from a different angle for both dramas. In OTWTTA, it was from the angle of the "cheating" spouses itself. In MWIHAATW, it was from the angle of the husband who was faithful and cheated on and the wife that cheated's reasons...but a big point is, the endings were opposite of each other. I don't wanna spoil, but one of them, the original spouses forgave and got back, on the other drama, the "cheating" couple got together. At that time, I watched MWIHAATW, instead of OTWTTA, I mean, just got to pick one "cheating" drama at that time. I was still on my "cutesy" drama phase.

Dating agencies. Matchmakers falling in love. The Undateables is more comedic while Murphy's Law has more angst.

Playing matchmaker while falling in love with someone yourself. Both stories feature dating agencies, cute main couples, and fun side couples. The romantic development is faster in The Undateables while Cyrano is more of a slow burn. Cyrano features lots of celeb cameos.

Similar storyline where the FL travels back in time through an accident from the modern period to the past and found herself entangled between guys who sought after her. However, in Oh! My Emperor, the FL knows the ML before this happened.

In comparison, Oh! My Emperor is lighter and has more fantasy and magical elements than Scarlet Heart Ryeo, which is heavier and a lot more serious and political.

Both center in revenge stories and in both dramas the main bad guys who control everything are similar. The K2 is a bit darker while in Lawless Attorney there's more humour included.