While chasing drug traffickers, a former agent finds himself stranded in a small mountain town. There, he finds an entrance to a mysterious shadow-filled world. Along with the leader of the mountain guards, they experience a strange adventure in this new territory.

As soon as Zhu Yun started college life, the world was completely turned upside down by the intrusion of "bad boy" Li Xun. He was regarded by Zhu Yun as a rich, ignorant and incompetent son, but his real identity was actually a special admissions student who was admitted by the school, and a rare programming genius. After several confrontations, the two have some appreciation for each other. The senior Fang Zhijing made things difficult for Zhu Yun many times, Li Xun took action to protect Zhu Yun, and invited her to join the preparation team he set up to win a major programming competition on behalf of the school.

When Gu Yunzheng, an associate professor of neurosurgery, goes on a medical aid mission in Lacaya, he meets Su Wei'an, a "deserter" who has abandoned her medical career to become a businessperson. From bickering all the time to falling in love with each other, he gradually discovers that all her abnormal behavior is caused by a genetic disease called Huntington's disease. The love for his beloved one makes him empathize with the sadness and despair of this incurable disease faced by 30,000 patients and their families across the country. Finally, Gu Yunzheng decides to give up his promising career and devote his life to the research of curing this rare disease, fighting alongside his lover to carve light out of the darkness.