Both of these k-dramas and mystery thrillers that involve the main characters being apart of a violent gameshow.
In both shows the contestants have to participate in games to survive and win money.
They both showcase how far humanity is willing to go for money through games.

Both of these movies have timelines that take place in the 90s and in the modern day.
The main genres for both of these movies is melodrama and romance.
In both of these movies the theme of unrequited and first love are prevalent.
They involve the main character being in a radio club.
They both have sad or bittersweet ending.