Recommendations

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.

A band of female misfits on a shared mission. Memorable / unique characters with personal depth. Both shows also tackle misogyny in today's world and showcases compelling female friendships.

-They both feature a bittersweet friendship between a loner or something with someone dying
-They are both very sad and such tearjerkers

Both dramas have something supernatural
In meloholic the main guy can see the woman’s thoughts
In GWSS the main girl can see scents
In both dramas the protagonists are linked to a case

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.