[Derived Before the Summer Solstice] It's the Summer Solstice

Hidden in the story that the author has not narrated, is there such a person's appearance that can change the direction of the ending a little bit and give this young man Lu Zhiang, who is as warm and bright as summer, a youthful memory that lives up to the name of youth? There are original characters (non-Sufibai), involving some time-travel elements and a lot of private settings. There are slightly more differences from the original work, but the main line of the story is still the same. There may be some adjustments to the timeline.