Recommandations

Both film is about friendship that started in childhood and been reunited by the death of a friend. Also both were musical.

It's not just because of the female lead that they are similar, it's the way the whole drama was set. The plot, the cute second lead, the boss who hates but loves her at the same time. There's plot twists about the whole fate thing. The only difference I guess is that the mains aren't childhood friends but the main and the second leads are.
Both dramas are funny in their own geeky kinds of way and the actors in both dramas are great and both dramas both go well as they are similar in these areas.

While Angry Mom and God's Gift - 14 Days don't sound similar in synopsis, the feel of these dramas is very similar. Both of them have a plot that delves into corruption and how it trickles down into society and has an effect on everyone. With both dramas, you get the feeling that there is a lot happening behind the scenes. Also, both feature a mother having to resort to desperate measures to protect her daughter.

Both dramas focus on bullying and the darker aspects of high school in Korea.

The protagonist this, King Jeongjo filme is a Prince Sado son's and it's a continuation of the filmd Sado, basically.

These two plots are very similar because one of the main characters receives a heart transplant from the other person's ex lover.

Both films are similar in subtext although very different otherwise. However, both films are very silent. In Daisy the main character can't speak for the bigger part of the film and in 3-iron there are no spoken lines before the very end. However, both films have excellent cinematography and artistic film-making, making them both very interesting to watch.

Similar rich person gets amnesia story. In Couple or Trouble, it is the female lead who loses her memory.

Both are dark and gritty dramas with a similar feel to them. They both have unconventional protagonists who are criminals/involved in the underground criminal world and deal with organized crime, are filled with action, and contain interesting plot twists throughout the series.

In both dramas there is suspense and crime. If you like Seo In Guk as a lead then I Remember You won't disappoint you! Also there is a love story

If you like suspense then watch Liar Game! In both dramas there is a psychopath and it keeps you on the edge all the time

Both of them have James and Bella as a main role, you have to watch Padiwaradda if you like the chemistry between Jiranee couple ^,^

Both darker human dramas by Nojima Shinji that are difficult to stomach and get through for many. While the plots are different for both, both focus on darkness within people and the aspects of humanity most people would rather look away from. Both have a very similar feeling to them.

both in bad guys and beautiful mind we have a "psychopath" as a main character. in both dramas the main character struggles to understand the people around him. also they are both pretty dark.

W and Nine are written by the same writer, Song Jae-jung, in which she managed to establish unique concepts in creating the world of both dramas. Even though W has only aired two episodes, it delivered a very intriguing and interesting story just like Nine. The two dramas have different plot (Nine is a time travel themed while W revolves in the fictional world of a comic character) but I must say, they actually resembles each other in the way that suspense, humor, and romance has a nice balance on the way the writer tells the story while still focusing on the fantasy element of the drama.