Content introduction: Nan Xiaomeng received a mysterious letter during the summer vacation of her first year of junior high school. She had won the silver medal in the Taekwondo National Challenge and was hired by a mysterious person as a security guard of the efs action team. Nan Xiaomeng, who was worried about tuition fees, couldn't help but be tempted by the generous betrothal money. By accident, she embarked on the path of exploring EFS with her childhood sweetheart Ming Hailuo, her friend Yun An and her classmate Bai Hang. Legendary ancient beasts, mirror mazes, strange urban villages... The series of strange events made Nan Xiaomeng can't help but doubt the ultimate goal of the efs organization. When a journey full of tests, courage, friendship and confusion begins, what unknown dangers are hidden under the gorgeous screen? When difficult choices are placed in front of you, where will Nan Xiaomeng go?