Solstice Advent: Start by Replacing the Heart

In 2154, the alien civilization "Supay" arrived, the world fell, and humans retreated to the Qinling-Huaihe defense line. In order to resist tyranny and hunting, mankind launched the "Solstice Transformation Project" with a very high mortality rate - transplanting the unanalyzable alien technology "Eye of Inti" into the chest of a 14-year-old boy and replacing it with a strong dark green heart. Alek Ming, a 14-year-old Shanghai boy, resolutely entered the Guangzhou Solstice Research Center in order to obtain medical subsidies for his seriously ill mother. When the catastrophe strikes again, the young man clenches his sword and kills through the eternal night in the name of the solstice!