Both are short (drama vs. movie) and have the same actor as the ML. The couple has an antagonistic or bickering relationship. Both are set within a fictional historical world with VR elements.
Both are movies set within the world of a historical game with the FLs from the real world. Both MLs are royal. The same actor and actress play the main couple in both movies.
Both are fantasy genres with a modern day FL entering the world of a historically set game in which she is royal. The ML is also from the real world and she has an antagonistic relationship with him there, but the two fall in love within the game. Both have a very similar feel and tone.
The two dramas are an inversion of each other - one is a real world person entering the world of a historical game, the other is a person from a historical game entering the real world.
Both are short movies with the same actor as the ML. Both are set within the world of a historically set game, and the ML is the emperor. Both movies are very similar in plot, tone, and the teasing relationship between the main couple.