One day in 2001, Jia Xiaoling, who had just been admitted to university, experienced a great ups and downs in her life. Proud to be a mother, she was deeply saddened by her mother's serious accident.

In a state of emotional breakdown, Jia Xiaoling unexpectedly returned to 1981 and met her young mother, Li Huanying. They were inseparable as girlfriends. At the same time, I also got to know a group of innocent and kind friends.

Xiaoling thought that she had come to this "vast world", and she could make her mother "do a great job" with her advanced thinking, but the result surprised Xiaoling and produced a series of ridiculous stories. Finally, Jia Xiaoling woke up in front of her mother's bed and found that everything happened because she missed her mother too much and had a dream

李煥英因為車禍重傷，躺在病床上，正處於生死之間。賈曉玲趴在母親李煥英身邊，因悲傷過度，昏睡了過去。突然間，賈曉玲的靈魂穿越到了1981年。在那個時代，她遇到了20年前，還沒有結婚的李煥英。

賈曉玲為了接近李煥英，就假扮是李煥英在省城的表妹。就這樣她們這對母女，就搖身一變，成為了“姐妹”。

接下來，賈曉玲在1981年所做的一切，就是希望讓這時的李煥英高興。因為在她看來，未來生了她的李煥英，過得實在不幸福。

在賈曉玲的幫助下，李煥英的生活有了積極的變化。首先李煥英取代王琴，成為了勝利化工廠，首位擁有電視機的人;其次李煥英在廠裡舉辦的排球比賽中，脫穎而出，獲得了廠長的賞識;再有李煥英被廠長安排，與他的寶貝兒子沈光林相親。

儘管賈曉玲明知如果李煥英與沈光林結婚，那麼她就不會再出現在這個世界上。但為了讓李煥英擁有一個美好的未來，她還是決定犧牲自己，成全母親。為此，她開展了一系列撮合沈光林和李煥英的行動。

在這期間，由陳赫飾演的冷特，也開始對賈曉玲有了特殊的情感。

不過，最終賈曉玲和沈光林都沒有得償所願。這個世界並沒有因為賈曉玲的闖入，而發生顛覆性的改變。最終，李煥英還是選擇了相戀三年的鍋爐工賈文田。