Wen Ruan and Fu Qingnian have been in love for seven years. Five months pregnant, she is preparing for their wedding. She has a rare blood type and has stored her blood every month for seven years in case of an emergency. On the day of her prenatal checkup, she stands outside his office and overhears him deciding to give the life-saving blood she has saved for seven years to the daughter of his childhood sweetheart, Lin Shanshan. A colleague warns that this could cost Wen Ruan her life, but after a moment of silence, he says, “Take care of the other side first.” Wen Ruan turns away and schedules an abortion. But when she opens the door to their marital home and sees another woman wearing her nightgown, her phone rings—and for the first time, Fu Qingnian's voice is filled with panic.