Modern woman Jiang Shutang time-travels to the 1970s, single-handedly and laboriously raising triplets. Through a twist of fate, she reunites with the children's biological father, the returned overseas scientific elite Gu Zhengnan. Having forgotten past entanglements due to a car accident, Gu Zhengnan takes the initiative to shoulder responsibility upon learning the truth and marries Jiang Shutang. Undaunted by gossip, Jiang Shutang applies her knowledge and capability to strive in her career. Hand in hand, the couple fights against toxic relatives and petty troublemakers, resolves internal household conflicts, protects their three children, supports one another, and strives to manage their burning-hot, happy life in the seventies.