The film tells the story of the sudden outbreak of the epidemic on the eve of the 2020 Spring Festival, which completely changed the study and life of senior high school students in Jinhe County, and a "big test" kicked off. Just as everyone was overcoming their own difficulties to prepare for the college entrance examination, a flood suddenly struck. With the joint efforts of the Party, the government and all sectors of society, a satisfactory answer was given to this "big test" for the whole society.