He paid an enormous price to transmigrate through a rift in time and space. His only purpose was to find his younger self, then kill him with his own hands, making the Jiang Xing of the present disappear from the world along with his past and future selves.
Theme: You think you're walking alongside the light, but in truth, you are the light.
I don't understand a bit, so how did they break the situation in the end? Lin's heart was gone and the two of them shared Jiang's heart to survive?