In a suburban area, the ground has started to sink, so a team of engineers, including Hao, is sent to find out why. Hao has spent days looking for answers in an empty suburb while carrying his heavy gear. He walks into a primary school and finds a diary that tells the story of a boy and the breakup of what seems to be a close group of friends. As Hao's investigation goes on, he finds out that this diary might have predictions about his own life.