This Young Hero Is a Little Cold (2021)

Both are set within the world of a historical game with the FL trying to accomplish a task to return to the real world.

Both have a modern day FL who enters the world of a historically set game.
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Both are mini dramas about a real world FL who enters the world of a historical game/VR in which they must complete tasks to return home.

Both are mini dramas about a real world FL who enters the world of a historical game/VR where they find true love.

Both are short dramas in which a modern day FL enters a historically set game with a host and must pass the levels to return to the real world.

Both are short dramas in which a modern day FL enters a historically set game with a host and must pass the levels to return to the real world.

Both dramas are about a modern day FL who enters a historically set game with a host only she can see or hear and she must pass the levels to return to the real world.

Both dramas are about a modern day FL who enters a historically set game with a host only she can hear and she must pass the levels to return to the real world.

Both are short dramas in which a modern day FL enters a historically set game with a host and must pass the levels to return to the real world.

Both dramas feature a modern day FL in historical times with VR elements.
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Both dramas have a modern day FL entering a historical fictional world and becoming involved with the ML. In the original story one of the leads (ML vs. FL) is the villain.

Both dramas are about a modern day FL who enters a historically set game and must pass the levels to return to the real world.

Both are set within the world of a historical game with the FL trying to accomplish a task to return to the real world.

Both dramas are about a modern day FL who enters a historically set game and must pass the levels to return to the real world.

Both are short dramas with a modern day FL in a historical fictional setting. The main couple are antagonists in the world, and the FL attempts to change things to survive.