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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.

This drama has a better "rich-boy-meets-poor-girl"-concept than The Heirs did. It's more realistic and heart wrecking.

They both deal with housewife being suspicious about their husband. Yakou Kanransha is more about the secret that lies in each family of the same neighborhood and how they deal with them

Both have a horrible crime and revenge

Both make you excited and watching it nonstop

Both are my favourites and have great actors ????

Both action dramas with breathtaking fighting scenes and all. Lee Min looks hella sexy just like Jung Kyung Ho <3

They both are about revenge and the main leads take the blame for what their lover's wrong doings because they can't picture their lover in jail.

Both of these Dramas depict a a clumsy girl chasing a rich, attractive and smart man. To accomplish her dreams of being with him, the female lead receives help from the male lead's family. Also, they show a large part of the life style of a married couple.

Similar genre, female protagonist. However, Himekawa has a more assertive personality as compared to Sakuragi in Zettai Reido.