Zheng Shuang is a hardworking single mom raising her only daughter, Guan Xi. Separated from her boyfriend, she learns to trust only herself and exerts all efforts to provide a happy home for her child. Li Yifeng is a career-driven doctor who has no time for anyone but his career. Living alone with a fast-phased life, he has developed a strong sense of independence and neglects the people who cares about him the most. A deadly virus threatening to destroy the country's population brings the two together. As the death toll rises, the two must work together not only to survive but to also save the people they love. Can she learn to trust him as they fight for survival? Will he be able to care for her before their time is up?