The supervisor on the side, Cai, however, expressed disbelief after hearing this.
"How could you possibly not know who's behind this? You were acting upon that person's instructions."
Supervisor Cai believed that the cleaner was just unwilling to tell the truth, which was why he claimed he didn't know.
Seeing Supervisor Cai accuse him unjustly, the cleaner hurriedly explained.
"Supervisor Cai, you're wrong, I did this because a kid gave me a note, saying that he would give me money if I did a favor for him. He offered a considerable amount, and I accepted the task in a daze, without thinking about the consequence it would bring."
The cleaner was initially tempted by the money, as the amount was quite substantial, so he agreed impulsively.
At the time, he didn't think too much and reckoned that the task was straightforward; it should have been harmless, so he obediently complied.