Shen Zhiwei, a 45-year-old professor of architecture, circled two names on the roll call: Lin Xiaoman and Su Wan. One is enthusiastic and public, the other is silent and stubborn. She selected Su Wan to participate in the international competition, but put Lin Xiaoman in charge of the school celebration project - using "teachers and students" as the boundary to separate the two at opposite ends. Know the slightest thing, know the danger and return - forty degrees of vinegar, turned into forty degrees of sweetness.