Bai Yu is an ordinary high school student. Because he accidentally discovered the black box left by his grandmother, he magically traveled to another era and encountered complicated and entangled emotional disputes, confusing gang secrets, and unexpected royal grievances. What about yourself? Should he choose the noble son who has been silently protecting him, or the cold and cruel killer who makes people feel pity. Why are the women around me always unpredictable? What are their true faces?