Treepon Promsuwan

Tan is hit by a car and loses his memories. He starts to live with the woman who hit him as she feels a bit responsible for hurting him other than the fact that she is afraid of getting into any trouble because of this accident. Tan is trying to recollect his memories while living with the woman and her nephew.

When old friends from school start dying one by one, Sayree and Nataya begin to search for the secret of the letter that each of their friends received before death. Soon the two believe they are the next targets.