The French ballad mentioned by Jane Anjie in Why It's Warm in Winter and Cool in Summer is an episode of the film The Veil called A la claire fontaine.

Why is it warm in winter? Why is it cool in summer? It's a warm-hearted work by Gu Xijue, the spokesperson of warm and cute youth. Twelve years of affectionate waiting, twelve years of infatuation. At one time, Jane Jie thought that Elvis was the wrong dish arranged by God for her, and he pestered her endlessly, as if she could not walk out of the shadow in this life. Elvis, who is naturally indifferent, has a domineering attitude. To outsiders, he is a favored son, excellent enough and perfect enough. Can treat feelings, but he is like a child, very sensitive and cautious. He often tries and can't help touching. When Anjie Leng Qing refuses, he consciously retreats to the most suitable distance, and then waits for the next move. "You know, I won't hurt you. But you have no idea how much I love you. " "I'm in no hurry. I have a lifetime to wait for you." "You have to understand me. I have been thinking about you for twelve years." Jane knew that from that moment on, something had changed. The wind is light and the flowers are settled. He waited twelve years for her smile. What is warm in winter and cool in summer, at your farthest distance, at your nearest pillow.