A school bus fell into a river during a heavy downpour. The bus fell through the riverbed and dropped into a cave. The four students and the driver in the bus could not find the way out and found themselves in deep trouble at the beginning. After that, both the ugly and beautiful sides of human nature were portrayed. This story is about their individual experiences and the transformation of their hearts. In merely seven days, the four youths matured greatly due to what they had gone through. The last day fell on a festive day - Mid Autumn Festival. Are these people going to be reunited during the full moon?