Childhood friends to romance within a circle of friends/schoolmates. School setting. Both are sweet and mostly light youth dramas.

School setting, sweet light romance.
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The ML is an android or similar like creation of a scientist, and falls in love with the human FL. Both MLs sacrifice themselves but return for a happy ending after a while.

MLs are the villain characters of the FL's story/manga. Both MLs at some point become aware that they are characters. In TMRFTS, the fictional character enters our world, in TROT&R, the author enters the fictional world. In the other's world, they fall in love and try to change the story to give the villain a better ending.

Both feature a self-aware manga character as the FL who is determined to change their story. In both their world will disappear when the manga ends.

A character created by the FL comes to life and enters the real world. He then falls in love with the FL.

In HL, a character from a manga enters the real world, WF is a person from the real world entering the world of a manga. They then fall in love with a person from that world while attempting to change the story.

Both feature a FL's character of her story coming to the real world and the two falling in love. DD is a novel, TMRFTS is a manga.

The dramas are sort of the reverse of each other - WF is a real world person entering a manga world, TMRFTS is a manga character entering the real world.

Both are short Chinese dramas about a manga character coming to the real world to convince the writer to change or continue their story.

Both feature a self-aware manga character who tries to change the plot of the story to give themselves a happy ending (EY from within the story, TMRFTS by coming to the real world).

Manga character comes to the real world, falls in love with FL who is a manga artist/artist's daughter. The manga characters "fade" as the artist draws/changes things, and there is a villain in the real world who is also from the manga world.