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Double face is a remake of Hongkong Movie, Internal Affairs, meanwhile The New World is a movie that is inspired by Internal Affairs movie. You'll find a lot of similarities between these two.

Similar shoujo appeal, terrible misunderstandings but endearing plot lines! Untypical main leads, but both are undeniably loveable. Second male lead is played by the same actor.

The main female lead has the same characteristics and the plot of the story both consist of the female lead being born with a specific illness/disease. The love story between the two main characters are epic.

Same actress/magic but I personally think it is better than The Legend of Zu as main character/actress is in EVERY episode with the emphasis on her experience/journey/love

If you're curious about Moon Chae Won (Swan) then you should watch this drama. It's similar to Goodbye Mr Black.

Aside from the first 4 episodes of Monster, they're pretty much the same: two guys competing against each other, one being the illegitimate child of the company head, and of course one girl both are interested in.

Both movies share some simiralities with the bullying theme and the students. Personally I liked both but Solomon's Perjury is more dark and it's divided in 2 parts

Both are about out smarting your opponent to survive. While Me & 23 slaves is a bit closer to the horror genre they were both very enjoyable. They also both consist of a male and female lead and have very colorful sub characters.

Similar storyline. Ordinary guy - Postal worker (That Fool), water delivery guy (Mr Duke), is asked by celebrity/rich heiress to pose as their boyfriend/fiancee. Both male leads are nice guys

same lead actor ~ Sung Joon and he makes the ladies swoon
same feel of romance and comedy

Both dramas are about a music agency, where the guy is the CEO of the company and falls for a girl of average standards.

They both give the same feeling. The relationship of the characters are also the same, building friendships and all. Both groups of friends did not get along at first but happened to be good friends after forming the cheerleading group in Cheer Up! and the Kirin Arts group in Dream High. Both are great dramas having strong friendship theme in its plot.

Its also a music based drama...with leads being Jung Yong hwa and Park Shin hye since fans wanted them together so bad in You're Beautiful... Its simple and adorable..

Roles are kind of reversed, the guy chases after the girl in From Five to Nine. Gives off similar vibes. If you liked one you'll most likely like the other!

Similar to Love Rain, Classic goes back and forth between the past and modern day, following different characters with various parallels. They are both heartfelt love stories, with nostalgia thrown in and lots of feels.