A story about growth and destiny, taking place in a foreign world where China and the West merge. Ling, a descendant of the family (nobles with demonic blood and social mission with demons). After the huge national changes when he was young, for the sake of his only younger brother and his future life, he entered the "forbidden school" - Dales College, and became a student of the Special Department. As a result, he met his lifelong best friend You He Ai, and lived a dangerous but comfortable life in the small Shikumen building at No. 099, The zero dormitory area. During a mission, Ling felt that his check and balance, Lei, was still there. And You also met a familiar figure in the other party's organization. Everything changed from this moment, but that was still the arrangement of fate...