Lin Heng's soul travels to the Divine Firmament Continent, where he is born as the son of Lin Changqing, ruler of the Chishui Kingdom, and his concubine Liu Ling'er. He awakens an invincible sign-in system. By signing in while still in the womb, he empowers his mother with a Supreme Divine Physique and extraordinary opportunities. During childhood, he signs in at the royal palace to grow rapidly and obtains top-tier cultivation techniques through secret-realm trials, but faces persecution from the principal consort, Su Ying, and others. With the rewards from the sign-in system, Liu Ling'er rises to become a supreme powerhouse and always protects her son. Eventually, Lin Heng awakens all his powers and embarks on the supreme path to invincibility across the myriad heavens.