Director Ma looked at Yue Tingting and began to play his trump card because, in his eyes, a rookie like Yue Tingting should be very concerned about her job.
Second High School, as one of Modu's most prestigious institutions, tops the industry either in terms of treatment or other aspects. Teachers who leave Second High School can easily find a fairly good job, but once Yue Tingting was reported by parents or fired by the school, she would be completely cut off from the teaching profession.
Actually, Yue Tingting was indeed among the youngest of the senior year teachers, but her capability was proven when she was recruited by Second High School to teach English for seniors. There were certainly doubts, but they were never as severe as Director Ma suggested.
But for a rookie like Yue Tingting, exaggerating the severity of the situation would scare them, thus smoothly enabling him to proceed to the next step and slowly achieve his goals.