Am I the Queen Mother Today (2021)

Both are short length dramas with a real world FL entering a fictional historical world and unexpectedly falling in love with the emperor ML who is the main character in the world. Both MLs have invulnerability of a sort (plot armor as the main character vs. an immortal body) that leaves toward the end as the FL messes with the plot. Both dramas have a guide who gives tasks to the FL and only she is aware of/can see.

Both have a real life FL entering a game world set in historical times and falling in love with the royal ML who is a fictional character in that world.

Both have a real world FL entering a historical setting game world and falling in love with the emperor ML who is a fictional character in that world. Both FLs complete the game and return to the real world, but out of love for the ML they choose to return to the game and spend their lives with him.

Both FLs are from the real world and in a historical game where they must complete tasks in order to return home again.

Both have real world FL who are in a game set in historical times. Both MLs are royal and have sweet, more caring personalities. Both have a "guide" who only the FL can see, who gives her tasks to complete in order to win the game and 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 real world FL enters a historical fiction world and falls in love with the ML. Both have a "guide" who tells the FL what to do or tries to keep the plot on track.

Both are short length dramas in which a real world FL enters a fictional historical world and falls in love with the ML.

Both have a FL from the real world who enters a fictional historical world and falls in love with the ML.

Both are short dramas with a modern day FL in a historical game like setting in which she has a guide and must complete tasks to return home. Both MLs are royal.

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.

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.