CCTV를 보면 두 명이 손을 들고 이동한 뒤 화장실에서 손을 씻어 독성이 있는 것을 잘 알았을 것이라는 추정이 나온다.
According to the CCTV footage, it is seen that the two people raised their hands and washed them in the bathroom, knowing well that they were toxic.