Recommendations

Both are short length dramas with four people in a love quadrangle. The same actor is the ML in both, and the tone/feel is very similiar.

In a story, the ML is supposed to be a destructive villain who falls in love with a noble lady (the FL of the original story). But the true FL (a modern day woman) accidentally gets sucked into the story where she takes over the body of a woman (not the original FL) and starts to interfere with the plot to ensure the right outcome. The "villain" ML softens and seems to fall for the true FL after she seems to fall for him first (despite her obvious interest in the SML, which makes the ML quite jealous).

Short dramas. ML is a powerful fighter with a serious demeanour. FL is flirtatious - definitely not shy. Both leads have an agenda and secrets. Both dramas focus heavily on romance and romance-driven sacrifice with very little plot or filler.

Teen angst among high school students
Unrequited teen love leads to plans to get the couple together
Best friend helping in executing a love plan
Music and a band.

You might think i'm crazy as in "why would you recommend this movie to this movie" , some will understand, some will not: these 2 movies have a lot of similarities like you can even imagine the teacher killer in "Lesson of the evil" as a monster because of his merciless and unique behaviour like the actual "monster" in "Project Wolf Hunting". These 2 "monsters" are unpredictable and unstoppable, the only way to survive is either to hide or being bold enough to confront them.
I literally could not predict anything about what was going to happen! This is one impressive and unique thriller that I wont forget.

Itaewon Class has everything and more , you probably watched it alreaady but its time to rewatch it :)

Both dramas are based on a novel of the same writer and both od them include criminal investigation and a doctor main character.

Both BL dramas take place in a medical environment and include criminal investigation.
They are based on a novel of the same writer and both are supposed to be sequels of Manner of Death.

Both are short length dramas in which the ML is a sweet but corny manga hero protagonist who comes to the real world and begins living with the human FL. Both dramas have a very similar quirky and funny feel.

Both have a ML who comes from a novel or manga to the real world and becomes involved with the FL.
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Both are mini dramas in which the lead(s) is/are self aware manga characters. Both play with common tropes/dialogue.

Both dramas have MLs that come out of stories to the real world and continue to have an overly romantic and idealized personality and behavior due to the way they were written.

Both are funny short length dramas in which the ML is a self-aware manga character. The ML of POB is corny whereas the ML of ZBNNSVZBLNNO is constantly trying to get out of corny tropes.

Both are short length dramas where the main couple are a person from the real world and a manga character.

Both dramas revolve around hospital/medical settings.
The leads start on the wrong foot, yet they soften over time.
Both have comedic elements and are warm