Lin Nanqiao and her best friend Xia Linshi suffer a car accident and accidentally transmigrate into a romance novel, becoming sisters-in-law married to the Ji family twins, Ji Chi and Ji Yu. In the original work, trapped by their obsessions, the two end up in an embarrassing exit. Living a second life, they let go of past conflicts, support each other, calmly handle the complex interpersonal entanglements within the household, rationally deal with the troubles brought by their original families, and quietly plan their own lives. Day and night together, they gradually develop mutual affection with Ji Chi and Ji Yu, beginning a sweet story of a marriage first and love later, while also encouraging the women around them to break free from constraints and live out independent and free selves.