Xiao Yong and Xiao Meng, finally a family, happily went for a walk with their dad and sister today. However, curious little Meng suddenly ran into the house with the green gate and got locked inside! A huge, terrifying monster lives there! Who is the monster in the green gate house? Will Xiao Meng be able to escape? Want to know what's going on in a dog's mind? Want to hear what a dog has to say?