Both are short dramas with the same actor as the ML, playing a very similar character. While one has fantasy elements and the other doesn't, both are set in school, and both FLs are chasing the ML for a long before before he reciprocates.

Both dramas are about the FL traveling back in time due to an object (comic book vs. phone), attending school, and forming a relationship with/trying to save the ML who is missing/presumed dead in her present time.

Both are short dramas in which the FL travels back in time and attends school alongside the ML. Both dramas have a similar feel and tone.

Both dramas about about a couple in two different worlds that are accessed through a manga/comic book.

In both dramas, the main characters work in filmmaking. Also the ML from ToL makes a cameo appearance as that character in episode 5 of VV.

Both are short length dramas with the FL entering the world of a story and becoming involved with the villain ML.

FL enters a different world and unexpectedly falls in love with the villain.
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Both have a real world FL entering a fictional world and finding love with the ML who is the antagonist of the story.

Both are short length dramas with a person from the real world entering a fictional world and an antagonist ML.

Both are short dramas in which the FL is in a fictional story (tv drama vs. story) and falls in love with the plot's villain.

Both are short dramas in which the FL is in a fictional story (tv drama vs. manga) and falls in love with the plot's villain.

Both are short length dramas with a ML who is a manga character and a FL who is from the real world. The two meet when one crosses over into the other's world.