Zhang Xiao, a senior high school student, has a strange power called “Master Key”. Since he was young, he can communicate with other “worlds”. One day, Zhang Xiao’s classmate Miao Xueling had an accident.

Zhang Xiao, a senior high school student, has a strange power called “Master Key”. Since he was young, he can communicate with other “worlds”. One day, Zhang Xiao’s classmate Miao Xueling had an accident.