The pervert principal sends text messages to women.

Shiatsu massage. The first message is "I'm watching you" and the attached picture is blood-red jelly. The second message is "You know too much" and the attached picture is a bloody doll. The two messages were sent to the same address, and they were both deleted after sending Liu's Dmail. The producer of the studio also gave a clear answer to this question: both short messages were sent to Yu Meng by FB, warning them to stop hacking and studying the time machine.