Lin Xi, a teacher at Sunshine Kindergarten in the suburbs, recently discovered that many children in her class had frequent nightmares, in which "aunties in black clothes" appeared. As a teacher who treats her children as her own, Lin Xi is determined to find out the truth, and unexpectedly discovers that it is related to the disappearance of a female kindergarten teacher many years ago. She has the ability to interpret key information through children's paintings. Relying on the clues in the paintings, she cooperates with the criminal police officer Chen Mo who was in charge of the case but failed to solve it due to insufficient evidence to restart the investigation. As a witness to the disappearance that year, the current director kept obstructing Lin Xi by concealing key evidence, and even tried to harm Lin Xi. In the end, the two of them broke through the obstacles and found evidence. They found out that the missing female teacher was silenced because she discovered that the principal had embezzled public funds, and the case that had been sealed for many years was solved.
