Adapted from Douban Reading's novel of the same name "The Blue Sky", Su Ming and Gu Jun are classmates in the police academy. After graduation, they started different life trajectories and love. However, one day, Su Ming was suddenly suspended and disappeared. Gu Jun thought that their difference was only due to class differences. However, as the case progressed, Gu Jun discovered the secret hidden in Su Ming. The dazzling sunlight penetrated the layers of haze, making everything clear. We may not fight with the dark forces with real guns, but we may all encounter the questioning of the inhuman you love...