"Mood of the Day" is a romantic comedy film that follows the story of a man and a woman who meet on a train. The man, who is a workaholic and always in a bad mood, is forced to sit next to the woman, who is cheerful and optimistic. Throughout the day, they engage in witty banter and slowly start to develop feelings for each other. As they spend more time together, they begin to realize that they may have more in common than they initially thought. Will they be able to overcome their differences and find happiness together?