Revenge stories where one of the leads hates/takes revenge on the other lead but ends up falling in love with them.

Both deep and fascinating dark, emotional melodramas.

In both the male lead hides his real identity as a rich guy/prince from the poor/ordinary girl female lead and works at a farm associated with the female lead.

How will the female lead react to the truth? Will their love be able to overcome the secret?

Both about romances in the midst of fame. TheGreatestLove about actor + former kpop girlband member, RakOrkAkard about two reality stars.

In TheGreatestLove the OTP is critizised/put down by the public; meanwhile in RakOrkAkard the public ships heavily/roots for the on-and-off screen OTP.

In both the public can be harsh to the OTP/the celebrities not treating them as humans, both show people the important lesson that even celebrities are ordinary people worthy of respectful treatment.

Both about love between 2 famous people. Perhaps love about two actors who secretly are exes who start working together(playing love interests!); TheGreatestLove about an actor and former kpop girlgroup member (girl who now guests on variety shows).

Love stories in the midst of fame. Perhaps Love about actors who are exes who work together and aren't maybe over each other, Rak Orl Akard is about an OTP who are secretly reality show stars which they aren't aware of (lol).

The behind the scenes of celebrity life in both. Perhaps Love is romance focused, meanwhile TheKingOfDramas is much more about drama making BTS than romance, but does feature satisfactiry romance at mid-end of drama.

Celebrity life behind the scenes, features romances also and how those are affected by fame.
TKoD isn't so much about romance though, but features satisfactory romance arc from mid-end of drama. RakOrkAkard heavily features romance.

Allthough otherwise very different plots, both feature the touching story of (literaly) poor underdogs, their struggles and their warm relationships.

Both include romances but the romance in Rak Ork Akard is much more in focus, meanwhile Iljimae doesn't focus much on it/develop it much.

Watch both if you enjoy rooting for underdogs and enjoy warm relationships between many people not just the OTP/aka. great side characters.

Both about the behind the scenes of korean celebrity life. TheKingOfDramas focuses more on the drama making aspect, less on romance (but has very satisfactory romance from mid-end of drama, drama is abit more than just the romance);
meanwhile TheGreatestLove is about the lovestory of two k celebs (movie actor & former k pop girlband member who guests on variety shows).
Both great!!

Clash of two cultures/worlds in both. The female & male lead must overcome their cultural differences (Past/Present in QIHM and poor/rich in ROA), including interesting settings. QIHM the past and in ROA interesting village.

Similar sense of silly humor in both dramas. The OTP/main leads of MyUnfortunateBoyfriend put in embarrasing situations, meanwhile ALL the cast of Rak Ork Akard (including the OTP at the start) bicker in similar fashion to the OTP of MyUnfortunateBoyfriend.

Also both have a male and female lead from two different worlds who have to overcome their differences.

Both features Social Anxiety in one of the main leads and how they try to open up to their love interests.