In a fantasy world where humans and alien races coexist, "secret realms" are mysterious spaces scattered around, which contain powerful spiritual gems and ancient inheritance, but are also full of deadly traps and magical beasts. The male protagonist Chu Fan is an ordinary human boy who accidentally awakens the rare "spiritual guardian" physique. He can sense the location of the secret realm and have the ability to purify the evil forces in the secret realm. In order to find his lost father (a missing explorer of the secret realm), Chu Fan embarked on a journey to explore the secret realm. On the way, he met four foreign women: Nine Tails, a fox girl who is lively and good at speed and detection; Elaya, an elf priest who masters powerful natural magic and is responsible for guarding an ancient secret land; Ling Shuang, an ice princess with a cold personality and the ability to control ice elements; and Molly, an undead witch who can communicate with the dead and knows many ancient secrets.
Chu Fan and four foreign women formed an exploration team and went deep into dangerous secret realms to fight against the monsters in the secret realms, other explorers who coveted the treasures in the secret realms, and dark organizations trying to use the evil power of the secret realms to subvert the world. Due to racial differences and respective missions, conflicts and disagreements often arise within the team. Chu Fan needs to rely on his wisdom and tolerance to resolve conflicts and gather team strength. During the exploration process, he developed complex cross-racial emotions with four foreign women. At the same time, he gradually uncovered the truth about his father's disappearance and the secret of his "spiritual guardian" physique, and finally took on the important task of guarding the balance of the fantasy world.
