Gu Xijue, who was once a royal censor, was falsely accused of collaborating with the enemy and treason, and was exiled to the north. However, he never expected that the person escorting him would be his ex-wife who divorced him three years ago - the current wife of the Marquis of Dingbei, Shen Zhiwei. The journey was windy and snowy, assassins appeared frequently, and murders and assassinations continued. He unexpectedly awakened the power of "causal retrospection" and repeatedly predicted crises and saved her from danger. She was as cold as ice, and he laughed and cursed, but at a critical moment of life and death, the two had to join forces to fight against the mastermind behind the scenes. As the old members of the Xuanlin Army surfaced, the shocking secret behind the divorce letter was gradually revealed: her betrayal was actually a death-defying defense in the name of love. In the ice and fire, old feelings are hard to hide. Can they clear their grievances and rekindle trust in desperate situations?