[National Time Travel] + [Sign-in System] + [Elf King] + [Doomsday Survival]
Everyone traveled through the Locke world to survive. In the dark and dangerous world, I chose the wrong pet!
But as the eldest son of the system, I awakened the universe's super invincible and powerful cowhide flying lucky sign-in system, and the sign-in reward on the first day was actually:... An egg? !
