This card's Japanese name is based on Hong Xin (read in Japanese as Kō Shin) and "horse" (hōsu).
Emperor Renzong sent Hong Xin to seek Celestial Master Zhang to help them in combating a plague. After completing his mission and before returning to the capital, he visits the temple near where the Master resides and unsuspecting releases 108 demons trapped in a secret chamber for centuries.
This explains the beginning of the "Fire Fist" archetype, "Hoshin" being the first monster being released; Hong Xin released the 108 Liangshan heroes.
On the other hand, this card's Chinese name contains the character 進 (jìn) which references to other characters, probably Chai Jin, Shi Jin or Wang Jin.