Recommendations

Films quite similar to each other, and the creator of the two films is the same person.

Both revenge dramas that include romance. ToW is a lot longer, but I don't feel like it's dragged (start from episode 30 if you aren't patient)

Hospital ER backdrop in EMERGENCY COUPLE. Mental Hospital backdrop in "IT'S OKAY, THAT'S LOVE." In both, the couples start out with a rocky relationship. In both, the romantic history between some of the characters adds to the interest of how characters relate during the drama. It's Okay, That's Love seems to be More Serious Drama with Comedy and Emergency Couple seems to be more Comedy with serious.. Both succeed at being respectful of the the serious material, while still delivering some fun comedic scenes.

From what I can tell It's from the same era, and the story/characters are somewhat similar to each other. Dororo might have a slight different genre, tipping more over to fantasy and may seem a bit ridicolus at times, but still has a great cast.

These are both office dramas loaded with great humor and good acting.

Both dramas have similar theme about young people trying to survive in music industry. And Ji Hyun Woo has the main role in both.

Same main Leads, the Chemistry between them is of the charts in any common roles they share, no need to say that Stairway to Heaven is the utmost classic tragedy, However carries the same sweetness in the love story as Temptation. Enjoy watching the Younger version of the leads in Stairway to Heaven and the adult version and chemistry of their scenes in Temptation..

If you liked Heartstrings try Trot Lovers, they both feature a pop singer male lead paired with a traditional music girl and they both have really good ost musical scores that are catchy and will get you wanting to sing along with them. They also both have really good and quirky side character relationships.

They told the same history. You can choose the new version or the old one

the story-line is just like dream high but dream high is light where as what's up holds some heavy moments.
anyway I recommend this one to anyone who loves musical dramas!!!!

Both the lakorns are Rom/Coms that has the contract marriage theme...in both the couple hate each other at the beginning but being forced to live together in the same house they start falling for each other...in both there's an annoying 2nd female lead (the girl the male lead originally loved) trying to steal him back!

Both dramas deal with the destined love lives of a young man and woman who is several years older than him. Both dramas follow the relationship of the couple as they grow together in their love as well as in their occupations, all the while realizing that love isn't about age it's about happiness.

Similar female leads - both are initially unaware of their royal lineage and work as spys/soldiers. Pre-Joseon era. Complicated love stories and political intrigue. Sisters fighting.

Set in a similar time period. Starts with parental story then moves to children after a few eps. Involves sisters and royalty. Complicated romances mixed with family secrets and political intrigue. Length.

Both Male Leads act a lot alike. Also they both go back and forth between love and hate relationship.