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As they are both Chinese series, they have the language in common.
They also have a similar vibe, with the costumes being the same kind of fashion.
Both have two male leads, one of whom is a doctor, facing off evil and investigating cases.

Just like Pornographer, Sei no Gekiyaku has some very mature contents. Both are made in Japan and concentrate on an LGBTQIA+ relationship. You could also (in my humble opinion) say that, in both Pornographer and SNG, one takes advantage of the other, leading to a physical relationship and feelings that begin to grow.

Both are Taiwanese BL series, with multiple LGBTQ+ couples. They both have an MC who's an orphan, and another guy who wants to take care of them.

They are both Pinoy BL series, and both deal with real problems people of the LGBTQ+ community face in a realistic way.

Both shows are absolutely gripping and showcase the growth of the unlikely friendship between a cold man and a female detective who knows how to hold her own. Both are trying to solve a case that leads back to corrupt politicians. If you enjoyed one, you'll definitely enjoy the other.

A popular teenager inexplicably finds herself in the body of an unpopular classmate -- and her body's new owner has no intention of switching back.

The series centers on Ayumi Kohinata, a first-year high school student who has a cute and shy personality. She's excited that she just started dating her first boyfriend, but on the day of their first date, she gets a mysterious call from her classmate Zenko Umine. Zenko says she's going to die, and Ayumi witnesses Zenko jumping from a building. The next thing she knows, Ayumi wakes up in a hospital, but in Zenko's body.

it has the same type or romantic comedy to it. the slight love triangle but no second lead syndrome (at least in my opinion). it also had rich family involved and also an underlying drama that became more prevalent later in the story.

Both are similar in that there are two male leads who have known each other since they were young and now work together in solving crimes through detective work. Both shows have a heavy bromance.

Both shows delve into human psychology and have a main character that is teetering between good and evil while the other main character is determined to keep them in the light,

S.C.I has a higher production value and is more action-oriented while RHGHHnS is more akin to Sherlock and solving mysteries. Both are excellent!

Very very similar premise where the three daughters of a prominent government figure end up fighting for the throne.

Similar plot. Female lead was a guy in modern day and his soul time travel into woman body.

La Luna Sangre is the sequel of Imortal. The leading lady in La Luna Sangre is the daughter of the main leads in Imortal. Angel Locsin also appeared in both series.

La Luna Sangre is the third of the Lobo trilogy. It was started with Lobo, then its sequel Imortal. This is the latest. Both have a story of a werewolf.

The main leads of both series are Daniel Padilla and Kathryn Bernardo. Both have romance in the genre. The leads have undeniably chemistry.

The leads of the two series are Daniel Padilla and Kathryn Bernardo. The director of Got to Believe and one of the directors of The Promise is Cathy Garcia Molina. Ian Veneracion was also in the both series.

It was directed by the same director Cathy Garcia Molina. Both are romantic comedies genre. Both have a story of a rich boy and a poor woman. Most of the settings of the two series are in the college since they are college students. The main leads of both series are actually dating in real life.