Even If I Die Before Dawn

(Third person in the full text) In that vast universe, there is a race. They have powerful technology and surpass the physique and strength of the Vitrum people, but they cannot fly. Instead, they have laser eyes, and they extremely reject and hate magic and gods. On that planet, there was a young man named Kay. His power was much weaker than that of his fellow humans, but he was extremely smart and became childhood sweethearts with Orelina. The story happened after the young boy Kai was possessed by Sebastian and teleported to the earth when he was on the run. However, he was invaded by other aliens 10 years later and had to start a war. During this period, he met the heroine Orellina who was also wandering. When he was about to win, he was defeated due to betrayal. That was when the protagonist discovered that everyone, including their enemies, was just a pawn in Sebastian's chess game, and he was playing into his own hands and became the fuse of everything.