Recommendations

-Poor Female Leads
-Rich Male Leads in a position of power
-Contract Romance and Marriage
-Cohabitation
-Male Lead has girlfriend in the beginning that the Female Lead "ruins" by events out of anyones control
-Sweet Second Male Lead
-The Second Female Lead and First Male Lead try to continue a relationship before guilt for the Female Lead gets in the way for the Male Lead
-Annoying Time Jump

Both dramas presents story about a girl and a guy who share the same room and later fall in love with each other.

Eat Drink Man Woman is an older Taiwanese movie and Let's Eat is a Korean Drama, but they both have romance and Food.

They are both about a romance between the king, and a lowly peasant who later becomes one of his concubines. There is also hate towards the main lead girl due to her low social status, and if you have seen Dong Yi, Yi San is King Sukjon's (the king in Dong Yi) which is also the king in Jang Ok Jung, is his great-grandson.

Very very similar, in terms of main cast, costume, plot, even setting, etc.
let's just say its a new Shomuni (5). While Shomuni 4 is a sequel of the past dramas (similar title), Age Harrasment is a another alternate ver. of the franchise.

Aaron plays pretty much the same role (CEO of a company) and the female lead also works for the company.

Both dramas are stories of revenge. The series surrounds the fulfillment of revenge for a beloved person who died violently when the main characters were younger. The stories' conclusions are reminiscent of each other. Ikuta Toma also stars in both dramas.

The story line is almost the same... The main male lead in Ex files 2 kinda reminds me of Rain.

Beautiful Gong Shim seems to be comedy/romance with some drama and Can You hear my Heart is drama/romance with some comedy. While Drama/romance with comedy is quite different from Comedy Romance with some drama, but I think you will find both dramas romantic storyline satisfying.
What they have in common is the actor Nam Goong Min playing a lead role that is wrapped in mystery pertaining to his childhood/parents/identity.

Both are romance dramas which presents love story between human and robot/cyborg.

Both are romance dramas which presents love story between human and robot/cyborg.

'Time Slip Dr. Jin (2012)' is the Korean version of the Japanese drama 'JIN' (2009) and 'JIN2' (2011).
Both deal with medical, history and time slip.

While the Korean version plays more with the romance by adding a male character as love rival, the Japanese version gives a more acceptable reasoning to why the time travelling happen.

Both of these dramas depict a male lead with two distinct and contrasting personas as well as a feisty female lead who grows fond of the male lead's gentler side. These dramas share similar tropes, yet are different due to their execution and plot devices (for example, SHNPT has a supernatural element).

Cooking and food that makes you hungry with light romance on the side