I just found this and started watching it randomly on YT without knowing anything about it. It starts off as a cute story about two (very cute) boys staying together and falling in love, which is a pretty overdone trope. It isn't high budget but the production isn't bad and neither is the acting.

Then it takes a turn, and becomes more of a psychological thriller. When one of the boys confronts the other about a past misdeeds, he has a psychotic break. What follows is a series of scenes that alternate cute and violent and for a while you're not sure which is real and which is not, as the character slides in and out of reality.

I know a lot of people hate having this stuff thrown in their BL but I actually thought it was pretty well done and I was impressed by the acting. But for the record, psychosis and violence don't often go together. It's a good plot for a movie but don't be scared of people with mental illness.