The sycamore tree on Wutong Street fell down, but the time capsule buried by the two girls was still there. One became a physicist and the other became a restorer of cultural relics. When they were eighteen years old, they held hands in the snow and separated amidst their father's roar. In the following ten years, they lived as traces of each other's lives that will never disappear - just like the ancient objects that Yan Sui repaired, the cracks will always be there, but the light can shine in from there.