The leader is my girlfriend

Wang Yiming transmigrated into a man's body, but while others became rich and powerful, she was utterly useless. Why was she being treated this way? If she had known this would happen, she would never have taken this job—a fitness instructor. By accident, she unexpectedly found herself transported to the 60s. What job could she possibly do? Teach people how to lose weight in an era of hunger and cold? Could she refuse to transmigrate? —No. Could she go back? —No. After much thought, she concluded that the root of the problem was—her loose tongue. Just when life was starting to improve slightly, she encountered a female demon from a novel. This was unbearable...