Both the BL dramas include a love story of two people who liked each other but were separated for many years and one of them has to regain the trust of his love interest who doesn't believe that the other one loves him.

Both of the BL movies come from the first decade of this millennium, so they evoke a sense of nostalgia, both are very realistic without the typical tiring BL tropes and they make you really relate to the characters. Both are criminally underrated on MDL.

They are equally horrible. The uke is portrayed as weak and awkward, does not have a backbone and the seme acts superior and arrogant and manipulates the uke most of the time. If you have bad taste, you'll definitely enjoy both of them.

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.

Same actors as the main couple and most likely, Trouble Maker will have the same light-hearted vibe as Love Stage!!!

Both series show flawed characters and include toxic relationships where one party wants something else than the other party (usually friendship X love X sex), so there is a lot of jealousy and suffering.

In both the series, the relationship of the main couple basically begings with sex and the feelings of the main characters to each other remain unclear for a long time although they sleep with each other repeatedly. Both series include hot 18+ scenes.

Both shows are light-hearted with no much drama or plot in general, good when you want to turn your brain off and just enjoy the cuteness.
One of the main characters is childish but cute.

In both the dramas, the main couple consists of a confident gay who falls in love with someone who does not know he can be attracted to men. The first guy is so caring towards the other one other one that the other one eventually falls in love, too.
Both series have sexy scenes and the main leads have good chemistry.

In both series, the main characters are lovers before they are boyfriends. One of them loves the other one but the other one keeps refusing his love for a long time. They fight a lot but also have a lot of passionate sex and eventually, they become a loving couple.

Both BL dramas have about the same quality and are about an infatuated guy chasing another guy who cannot decide if he wants them to be friends (possibly with benefits) or something more.