Lianyi was originally a killer in the organization. He started doing this job at the age of fifteen. He committed one of the top ten strange cases in the police industry for two consecutive years. Once, he had a quarrel with Gin over the content of the task, so he broke with the organization. Detective Baima is the assassination target assigned to Ripple by the organization. In order to protect his safety, Ripple enters the high school where Baima attends. She had long despaired of life and was indifferent to anything, but in getting along with her friends Xiaowei and Baima, she rediscovered her desire for life. She had feelings for Baima for the first time. When she was immersed in happiness, Baima began to investigate the ten strange cases, which made Ripple feel uneasy. Can she continue to go with Baima?