This isn't a bl explicitly but the male leads have pretty intense chemistry and tension through out that makes it better than so many of the actual bl's out there.
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 director and screenwriter. Both share the premise of an inspector investigating a series of serial killings with his lover being a prime suspect in the murder cases.
Both Dear Doctor, I’m Coming for Soul and Spare Me Your Mercy are Thai LGBT / BL Dramas that have a doctor as one of the main lead characters. Both deal with death in their primary story line.