The Cornered Mouse Dreams of Cheese (2020)

Both movies have the same premise - private investigator gets hired to spy on ML and his... endeavours and gets involved with him

Both movies are japanese BLs which has psychological and really realistic stories with characters that are messed up psychologically, who become better persons by meeting each other and influencing each other to overcome their insecurities.

Definitely not straightforward and fluffy and but a very real and relatable piece of work. Even though the settings are quite different, the overall realistic and problematic vibe is the same.

-LGBTQ+
-Japanese language film
-One man obsessed/in love with another who is more elusive with his feelings
-Explicit sexual content