Well....there are so many similarities that I can't even write them all because that would spoil them. What I will say is:
-Both females leads are low born and are interested in a form of art, while in Dong Yi it's music, in Yi San it's painting.
-Both female leads fall in love with the king.
-Both dramas have a second lead who is a brotherly figure who eventually ends up forming one sided feelings for her the female lead, and she'd known him since she was a child.
-Both female leads are forced to lose their brothers at a young age.
-Both dramas have a powerful villain who at one point was queen.
-Both female leads develop close relationships with the queen of the king they have fallen in love with.
-Both dramas will make you cry, though you'll most likely cry a lot more in Yi San, because Dong Yi is a bit happier.
Basically, both dramas give off the same kind of feeling because after all, the SAME writer AND directors who produced Yi San produced Dong Yi, and vice versa.
-Both females leads are low born and are interested in a form of art, while in Dong Yi it's music, in Yi San it's painting.
-Both female leads fall in love with the king.
-Both dramas have a second lead who is a brotherly figure who eventually ends up forming one sided feelings for her the female lead, and she'd known him since she was a child.
-Both female leads are forced to lose their brothers at a young age.
-Both dramas have a powerful villain who at one point was queen.
-Both female leads develop close relationships with the queen of the king they have fallen in love with.
-Both dramas will make you cry, though you'll most likely cry a lot more in Yi San, because Dong Yi is a bit happier.
Basically, both dramas give off the same kind of feeling because after all, the SAME writer AND directors who produced Yi San produced Dong Yi, and vice versa.