Cheng Yanran and Gu Shaoqing first met on the high school campus eight years ago. He watched with a smile behind the rows of plane trees, while she lowered her head and read under the shadow of the layers of plane trees. They met again eight years later. She was walking on the Wutong Road on the university campus holding the experimental data. He stopped in front of her and said, "Cheng Yanran, are you the goblin on the Wutong tree?"