It should've been a normal job. Chuuya breaks in, kills some people that are on his list, the usual. But when he very loudly breaks the window on accident, they still don't seem to notice. He's on the second floor so he walks to the stairway. And... he hears two people. Probably a couple, yelling, screaming, just arguing. Loudly. Chuuya will deal with those two later, just... time to go look in the other upstairs rooms.