Somchai, a debt-ridden gambling addict, goes to the top of a building to commit suicide and finds a young woman, Go-go, standing on the ledge ready to do the same.
Nuan's engaged to Chai. His family owns a mansion that's given as a wedding gift but Chai's mother wants to take the mansion back to get money for her debts. To do so she has to get rid of Nuan. Nuan dies but comes back as a vengeful ghost to haunt the people who caused her death.
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.
