Hello Everyone, 

I've currently watched jdorama Siren and I like the combination of mystery and romance. Can you please recommend me similar dramas like Siren or some mystery doramas with romance? (even hints are okay cuz I know jdoramas rarely combine mystery and romance genres). 

Hi! Siren is interesting, I should watch it. These are good mystery-romance dramas:

Kiken na Venus- a mysterious woman claimed that she’s the male lead’s missing brother’s wife

Tengoku to Jigoku: Psycho na Futari -body switch between a police officer and a suspect 

Bitter Blood -father and son partnered as police officers, with a police woman as the son’s crush

N no Tame ni-  categorized as “iyamisu”( “ew mystery”), dark and has an aftertaste. The lead actress, Eikura Nana, got married with the second male lead, Kaku Kento after co-starring in this drama :)

Thank you so much for your recommendations. They're all noted in my watchlist. If you don't mind, may I ask you the name of one drama? I only rember the synopsis. It is about a male lead who can foresee a person's death from his eyes and he saw that in the eyes of his grilfriend. I totally can't remember its name so i'm asking for your help😢

You’re welcome! 

4-pukan no Marigold- I’m not that sure ‘cause I have not completed this drama, but the male lead here also saw visions of death 

Hello Harinezumi - about a team of detectives that solve requests of their clients that no one else would want to do. It is mix of almost all genres and both mystery and romance are significant parts of this amazing and funny drama.

SeijoThis is my fav. because of Older woman/younger man relationship and Hirose Ryoko. Sadly, it didn't ended the way I wanted it to. 
Waiting in the Dark 
Dying Eye - Haven't finished it yet, but seems like it has all the elements to be a good Mystery-Romance drama. 

watashitachi wa douka shiteiru

Saiai - Sanada Rio, Sanada Wellness' CEO, becomes a material witness in a series of murder cases which is related to a missing person case 15 years ago in her hometown. Her first love, now a detective, chases after the truth while a lawyer tries to protect her.