Genius girl Xia Wanqing suddenly receives a message from her deceased mentor. The former principal has left his proudest student the unsolved problem of his entire life as her final research assignment: a class of so-called "good-for-nothings" that the school has given up on. Xia Wanqing arrives as the homeroom teacher of Senior Year Class 13. She cleverly handles the provocations of the "Four Troublemakers" and forcefully launches her classroom restructuring experiment. She provides targeted guidance to the students, but faces opposition from the conservative faction. At a school-wide assembly, the current principal reveals her identity as an international young scientist, turning the tables. Under Xia Wanqing's leadership, the students ultimately achieve a miracle in the national college entrance examination.