C116 Nullification(1)

There's a reason behind all these wrongdoings, and each debt has its owner. I can confirm that Fatty is the culprit, but I am not just randomly guessing. According to the Detective's logic, there is a phrase called 'guide'.

Initially, the fatty insisted that he did not come to this room during that period of time. However, when I brought up the idea of finding evidence of Fatty coming here