On his 18th birthday, Jan Wen shoots randomly at the crowds in a night market for unknown reasons. The tragic incident causes a strong impact on the lives of his family and friends, the victims and the witnesses. However, if there was a chance for them to make different choices, would the tragedy still happen? Will it be a different outcome if they all changed their behaviour at the crucial moment?
Xiaowei disappeared, and the divorced couple began to search for their son's whereabouts. With a photo of Xiaowei's injury, they found Wang Hao, the young man who was carrying the secret. Following the clues left by Xiao Wei, we discover step by step the unknown side of Xiao Wei; Xiao Wei still has not come back, but every moment everyone lives, it is as if Xiao Wei has never left.