By some mistake, Wu Meng, who had dreamed of becoming an angel in white since she was a child, came to her high school classmate, X University of Science and Technology, a famous engineering school that Qiao Shuyu had longed for. From then on, she began her life as an engineering woman. Because of her cold temperament, she once thought she would be alone forever. Until that rainy day when she forgot to bring her umbrella, a stranger raised the umbrella over her head. From then on, there was a handsome and sunny future male doctor named Nan Yang in her monotonous world. What she didn't expect was that not long after, a school joint training project reunited her with Qiao Shuyu, whom she had not seen for a long time. The object of her childhood crush now became her classmate again. How should she choose between protecting the warmth of the present or embracing the regrets of the past? And what impact will Teacher Zhang Hai's intervention have on them?