[A male lead who trusts the female lead without question, and a female lead whose personality is the complete opposite of her appearance] Infinite-universe adventure, romance, two powerful leads, pure love. The leads are childhood sweethearts. After an accident, they inexplicably transmigrate into a world inside a tomb. There, the female lead discovers that her long-separated younger sister, her future brother-in-law, and his college roommate have also arrived in this world.
In the end, they use their intelligence, teamwork, and trust in one another to escape this world successfully.
