Synopsis：In the autumn of 1997, in search of her missing best sister Xiu, Chen Youxi escaped from the orphanage and came to Tanling County alone. Before her disappearance, Xiu worked as a nanny for the Li family, and after her disappearance, the Li family accused her of running away after stealing from them. Chen Youxi is very sure that Xiu did not steal from the Li family, and the family is highly suspicious. Chen Youxi finds out that the Li family's daughter Li Wenwen, who was missing many years ago, is similar to her age. So, she decided to pretend that she is Li Wenwen and enter the Li family. During her time in the Li family, Chen Youxi is surrounded by warmth from the family and gradually lets go of her suspicions. But she eventually finds out that behind the "warmth" there are lies, crimes, and death, and the family members are more complicated than she imagined. Unknowingly Chen Youxi has stepped into danger...