One afternoon in the winter of 2017, Gu Yuan was nestling on the bookshelf with a small heater in his hand and quietly looking at the book in his hand. Suddenly he saw an introduction about the coccyx, and he stretched out his foot to kick Chi Yu who was working next to him. Chi Yu immediately stopped and tilted his head slightly, "What's wrong? Are you cold or hungry?" Gu Yuan's heart was suddenly warmed by his words and she was embarrassed to complain about how he made her sit on the ground when they first met. Looking at the girl who was just staring at him without speaking, Chi Yu came to her side, "What evil deeds of mine are you thinking about again? Let me tell you, and now I won't be able to sleep well at night if I don't hold it in." Gu Yuan blushed and murmured in a low voice, "It wasn't the first time we met." After hearing this, Chi Yu smiled softly, "Oh, back then..."