Back Before the Dawn

Lin Jian, whose body is part mechanical, and Bu Xizhan, a mysterious youth, have a destined encounter when they both witness the destruction of a small mountain village. The pair somehow end up journeying together, during which it becomes clear that the two are complete opposites. The former is a straightforward and heroic champion of justice, while the latter is a secretive schemer who tries to avoid fighting as much as possible.
Will this journey drag the pair of them to hell? Or will it result in their salvation?