Pororo and Eddy are snowball fighting. When Pororo is better at throwing than him, Eddy gets angry and thinks of a way to get him back. He hides a cannon under the snow and throws snowballs at Pororo. Pororo and Crong think it's a ghost throwing snowballs and run away. While Loopy's passing by, she gets scared by the snowballs too and goes to Poby's house. After listening to the story, everyone leaves to look for the mystery snowball ghost. Will they find out that the snowball ghost is Eddy?