Scarlet Hairpin

Su Qing, the criminal investigation captain who returned home on a rainy night, found the same red hair card for the third time at the scene of a serial murder case - exactly the same as the one left behind in her sister's disappearance ten years ago. As the investigation deepens, she discovers that all the victims are related to the orphanage where her sister was, and her lost memory fragments seem to contain key clues pointing to the real murderer. As she got closer and closer to the truth, she found that the shadow of the red hair card had already shrouded her life.