This plot can come from many novels. Here are a few possible names: 1 " Soul of a Car Accident ": This is one of the more common names and is easier to understand. [2. Soul Exchange: This name is more detailed, but it is enough to describe the protagonist's experience.] 3." Going to School in the Place of My Sister ": This name was more specific and highlighted the experience of the protagonist's replacement. 4." Love with my sister's teacher ": This name highlighted the love story between the protagonist and his sister's teacher and was easier to remember. I hope these names can help. If there are other plot requirements, please continue to ask questions.