xThePurpleWolfx
But when one took a closer look at all those people's lives, discoveries were made not so often about a tragic backstory but more about horrible acts. Kaeya knew this better than most, and he wouldn't be surprised to see anyone with power and money do whatever crossed their mind whenever they pleased.
Because when they lived that kind of life they couldn't ever be content with the things they already had, always searching for ways to acquire more, or just to simply satisfy whatever urge they had.
Even when it involved someone's death.
***
Or: Veterinarian Kaeya, also a hitman who never fails to kill his target, meets detective Diluc, son to one of his clients and also the person in charge of finding the culprit of numerous unsolved murder cases.