There is a lot to like in this as another reviewer has pointed out (Theophilus Silas). Clever writing so that character stories interact between loops. Intellectually engaging. Pacing is generally good through the first half with just a few moments of scene stretching to inflate emotional impact (a pet peeve of mine in Thai dramas). However, in the last episodes, things get a little unsure, scenes that don't add much to the story and seem to just run out the clock. The mental stimulation solows down and I found myself looking for meaningful bits, and being a bit disappointed. Its mainly just "holding your breath" waiting for the final reveal. Also, a bit more scene stretching which, for me, gets a bit tiresome. Probably the most irritating is nobody calling the police in the last episode. Ever. In the day of ubiquitous smart phones, having named characters not call emergency services is just too much, especially when the scenes are stretched, and viewers begin to expect something to happen. A lot of standing around staring at each other. Better editing would have avoided that. I think the same material could be edited down for a (longish) movie, and it would be dynamite.

Even so, a clever and interesting BL. If you have recently lost a loved one, this could be a very emotional watch. I cried quite a bit. I don't know if I have the energy to do a re-watch. Time will tell.