Bella, a low-level mail carrier, secretly replies to the letters of a depressed rich heir, pretending to be an angel to heal the child. However, she is mistaken for a fraud by the child's father, the violent CEO Mark. To calm his son, he signs a contract marriage with her. She melts his icy heart with warmth, but is framed by a rival and cast out. Eventually, the CEO discovers the truth and regrets his actions, going to great lengths to win her back. The family of three is finally healed and whole.
