A group of idealistic young people train hard in the Assassin Academy, eager to complete its trials and become heroes. Han Xiaochu, the top student, is the first to receive a chance for the trial. However, her progress is interrupted by the carefree and seemingly useless student, Long Bixie. As the trials unfold, unexpected challenges and mysteries arise within the academy, and Han Xiaochu must navigate through them to find a way forward.