"Ha-ha." The shooter laughed madly.

Standing at the door of the classroom, the head of security looked sullen.

The martial art practitioners and soldiers who were standing next to him also looked serious.

Just as what the shooter said, the RDX was an extremely dangerous explosive. With so many explosives on the shooter's body, once they exploded, all the classrooms around would collapse in an instant, let alone this one. At that time, all the ...