Seventeen-year-old Lin Xingmian was sorting out his grandmother's belongings when he accidentally discovered a camphor wood box engraved with star trails. The yellowed letterhead and hand-drawn star map at the bottom of the box reveal the half-life-long love affair between grandmother Lin Qingci and the astronomer Shen Hengzhi of the Republic of China. During the war years, a pair of like-minded young astronomers got to know each other through research on comet Yuheng, but were forced to separate due to the turmoil of the current situation. Shen Hengzhi disappeared mysteriously to protect the precious cosmic ray research results. In order to fulfill her grandmother's unfinished wish, Lin Xingmian and her friend Chen Yu went to Baihua Mountain in Peiping to find the truth by following the star map code. When Comet Yuheng, which only occurs once in 76 years, pierces the night sky and the star paths coincide, it not only solves the mystery of Shen Hengzhi's disappearance, but also makes a deep love and persistence that spans half a century reappear under the starlight. This is a pursuit about youth, faith and love, and it is also a gentle reply to the stars and the years.
