Really. According to a query on NetEase Entertainment, the name Longmen Theory is real. It is said that "Longmen Lun" is an ancient Han philosophical article derived from the notes "Guwenyuan" written by Han Yu, a famous scholar in the Tang Dynasty. "Guwenyuan" records a mythical story called "Luoyang He's Chess", which tells the story of a chess player named Long who passed through seven difficulties on the Dragon Gate and finally obtained the divine chess gifted by God.