In the autumn of 2011, in Haiya City, which is near the sea, the coconut breeze blew gently, and the banana shadows swayed. Lu Zhu, a criminal police officer transferred from Beijing, met Tong Yan, a forensic doctor from the same branch, during a dispute over injury assessment. Afterwards, the two changed their views on each other during their collision and cooperation and gradually became aware of each other's hidden pain. At this moment, a bizarre rape and murder case forced Tong Yan to face the nightmare that had haunted her for many years: the serial killer who killed her twin sister reappeared 24 years later and was still following her!