Similar group(s) of people searching and chasing after ghosts.
OH no here comes trouble, is much more Comedy than Revenant, but also has an interesting storyline similar to revenant

Second season of Utsukushii kare with
Similar vibes and equally nice cinematography.
Also both are BL and set partly in university.

Similar vibes and equally nice cinematography.
Also both are BL and set partly in university
(in the first part of Utsukushii kare the characters are still in school.)

In both story the Main Character meet accidently and build a Sexual-friendship, in both story the Leads were hurt by their ex-Partners and in the beginning the other lead is a distraction for them. But in the end they both get together.