Kindaichi Shonen no Jikenbo 5 (2022)

In these two dramas, a member from police needs the help from a student ( so someone who is not a detective and is supposedly not qualified to participate in an investigation, but he is ). The male lead is really smart in KSNJ5 and can do things that others can't ( mainly in ONHCT). But although they are good at investigating, they are not really smart in studies so others often look down on them.
In both dramas, they do not investigate common cases, mainly in ONHCT because it is a fantastic drama with supernatural elements. Both dramas can be both funny and really serious.
I would say that ONHCT is more serious because it deals with the theme of mourning througout all the drama. Neverthless, it still is a really funny drama even more than KSNJ5 in my opinion.

Both main characters solves murder cases that are riddled with difficult clues.
Both are recruited by the police to solve cases and both are young men who like girls so much.