An old city in the south that has both a pyrotechnic atmosphere and a slow pace. The core scene is the old community of "Wutong Lane" where the two people lived in their youth - the red brick walls are covered with green vines, the old locust trees at the alley block the sky, the smell of soy milk and fried dough sticks from the breakfast shop downstairs, and the chatter of neighbors enjoying the cool evenings form the warmest background. From kindergarten to high school, the two walked in and out together on the stone paths in the alley. Qin Zhiyao always chased Fu Zhiheng, giving him graffiti-covered notes; Fu Zhiheng silently helped her carry her schoolbag, fended off naughty boys, and stayed with her to do her homework at the stone table under the old locust tree until dusk fell. Although the university moved to the Xincheng campus, they still go back to the old neighborhood every weekend, eat a bowl of wontons from the alley, and walk under the locust trees. The slow time in the old city is intertwined with the new opportunities in the new city. It not only witnesses the growth and transformation of the two of them, but also makes the deep love hidden in daily life become more mellow over the years.