June 1, 2007 will be an unusual international children's day. Because at 14:46 on this day, in Changchun No. 137 Middle School, a group of ordinary teachers and staff, in order to stop a knife-wielding hooligan from committing violent crimes against students, regardless of their own safety, engaged in a desperate battle with the thug. Vice Principal Yu Hongjie, Director of the Political Education Office Jiang Yu, and political education teacher Hou Weidong were seriously injured, and driver Wang Ge was killed in action.