Mr.Kill

both are dramas from thailand where a mystery needs to be solved and the two male leads don't know if they can trust each other or not

The themes are quite similar in both cases, the killer is inspired by a comic book and the author is the prime suspect.

Both stories feature a manga artist male lead aiming to uncover the real identity of a serial killer as that person is somehow directly connected to him. Thriller, Crime, murder mystery

Both stories focus on a series of murders that are all done in the fashion of a particular story/manga/book. The main characters try to stop this series of brutal murders.

Both shows are Thai GMMTV produced BROMANCE shows (so no direct romance but very strong bond between the two main male characters and similar promotion than BL). GMMTV saw a lot of success with high school frenemy so Mr.Kill is their next attempt at establishing such a bromance pairing, using the previously popular "ghostship" DewTee.

GMMTV produced shows with a lot of overlapping casts. In Burnout Syndrome, Dew got in between the Offgun pair, while in Mr. Kill, Off seems to disrupt the DewTee pair (or he at least shows up in a similar enemy/rival role than in Burnout Syndrome). In both, the main characters is an artist too and the vibe seems more serious.

Both shows are dramatic thrillers with Dew playing a main character and Chic Sakon Tiacharoen as the director. They characters become involved in a bloody series of events that they try to stop.

Both are gmmtv produced series in which two guys who starts off as rivals have to work together to solve a series of murders that are connected to one of them (in Mr. Kill, the murders are inspired by the MCs comic, in Dare you to death the MCs brother is the prime subject/at risk of getting killed). During the investigation, the leads become very close in a romantic/bromance (Mr. Kill) way.

Both involve a fictional character coming to life involving crime and investigation.

Both shows have fictional events from an online book/manga coming into play in the real world

Both are thai thriller dramas about two people having to team up together and combine their knowledge and strengths to solve a series of gruesome murders. One of the characters is a police officer investigating the case and the other is the prime subject, who is also an artist. An unlikely connection starts to form between them that (almost) becomes romantic.