Qiao Yan, born in a border town in southwest China, becomes a star actress after much effort and struggle. But despite her aura of glamour, she always feels hidden pressure. When she receives a threatening anonymous letter, her long-estranged sister suddenly comes to see her.

In the 1940s, the world was in turmoil, and it was crucial to decipher the enemy's communication codes in a timely and accurate manner. Rong Jinzhen has shown amazing mathematical talent since her childhood, and because she solved the problems assigned by her math teacher, she was noticed by more people, and even walked into the door of code-breaking by mistake.

A woman's struggle and confusion ultimately lead to her profound transformation and rebirth.

In Damai Field Village, a city girl named Kui Hua lives with her artist father. One day, her father tragically dies in an accident caused by extreme weather, leaving Kui Hua an orphan. Although poor, a kind-hearted family takes her in，the family of a boy named Qing Tong . Growing up together as brother and sister, Qing Tong and Kui Hua care for and support each other through a time of material hardship.

On the morning of the winter solstice, Tang Yu's son disappeared in the stairwell; gambler Yuan Wu hid his father's body; and two unsolved cases involving the assault.