Jaeha's Things

ok so basically its set in a dystopia world where these government bots roam around "helping" civilians. mc sees his bestfriend get killed by one of these bots in broad daylight but everyone forgets abt it, acting like nothing happened. he then goes on a little journey to find out whats REALLY going on. the genre is thriller horror mystery?? also the bots kill humans to turn them into some sort of fuel l.

I've been looking for this for sooo long if anyone can help pls!! I dont remember too much but the ML gets married to a girl in the end. pretty sure he divorces her later and then meets MC again and thats how the story ends. I thibk the MC is an art student too. ML has the typical dark blue/navy hair!!