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Zhang Wanqing and her husband Li Guo'an had a daughter, Li Yanshu, living off his coal mining wages. When Guo'an died in an accident and Wanqing gave birth to another girl, her mother-in-law kicked them out and sold the baby to trafficker Lao Sun. Wanqing left a bite mark on the baby's arm before parting—unbeknownst to her, Tang Qingshan, who secretly loved Wanqing, rescued the child and raised her as Tang Xueli. When Wanqing time-travels back to age 18, their paths collide again.