the play tells the story of the children of several forbidden city cultural relics restoration craftsmen, including shao xue, zheng sunian, zhang qi. they grew up together in an alley in beijing. they experienced the sars epidemic, the death of elders, the demolition of ancient cities and other storms, and formed deep affection. aaa。 as people grow up, they also choose completely different paths due to differences in personality. influenced by zheng sunian's mother, shao xue was unwilling to give up the infinite possibilities of the future for love and chose to go far away; zheng sunian inherited the will of his elders and became a cultural relic restorationist, sensing time and gaining strength in immortal cultural relics; zhang qi was admitted in advance because of his mathematical talent. even though they are in line with each other, the young shao xue and zheng sunian still parted ways because of their respective pursuits. after years of separation, they met again, and the seeds planted in youth broke out again...