Martial Arts Master

My name is Chen Feng, and I was assigned to be a teacher at the Yuying Martial Arts School, one of the worst in the city. The principal said that this class of students are all F-grade trash and they can graduate in just three years. I looked at the student file and was silent for three seconds. The SS-level ice mysterious body was sealed? Graded F. S-class Overlord Thunder Bone was misdiagnosed? Graded F. Are you born with a full fighting instinct? Still rated F. I turned around and asked the principal: "Does your evaluation agency open blind boxes?" Principal: "..." Three months later, the city's martial arts joint examination. All the members of the "waste class" I led passed the test, and the key class next door was completely wiped out. The head teacher of the key class collapsed: "How on earth did you teach?!" I smiled: "I didn't teach them much, I just held a 'parent-teacher meeting' for them."