Both series are revenge stories where the main female lead becomes the teacher of the child of the person/people she is exacting revenge against.

Both series are audition programs that follow the formation of a boy group under BMSG. Throughout the course of the show you see multiple performances of original songs and the development of the skills of the trainees.

Both stories show the bleak side of life and the people trying to survive in the midst of it poverty and crime.

Both series take place in the palace with the main female character working as a maid in the royal kitchen. The preparation and serving of food is a major component.

Both series are about a young adult falling in love with a much older individual and finding the path they want to pursue in life.

Both series are largely set in after-school cram schools were the female lead is a teacher and the male lead is her student/former student who develops feelings for her first.

Both titles are about two people suffering from their own problems but circumstances allow them to encounter one another and find solace together.

Both movies are about an LGBT parent or parents forming a bond/family with a child and the pressures/criticisms they all have to face due to the prejudice and discrimination present in society.

Both series are about an animal/insect turning into an attractive young man. They don't know how to properly act like a human and many situations take place as result.

Both series revolve around an animal/insect turning into a male human being to help a woman. A fluffy romance follows.

Both are about a group of high schoolers who grew up in the same apartment building and are now involved in a web of romantic/sexual relationships with dark emotions and motivations being rampant.

Both are dramas about someone needing an organ transplant for a family member. They meet someone with a terminal illness who is willing to donate. They must get married for the transplant to be legal but eventually end up falling in love.