I Am Grandmother Yai sang ma yaiKuad and Kai are siblings who are apart from one another since their childhood. Kuad is brought up in a slum and supports his life by playing gambling whereas Kai is with his grandmother. When an accident causes grandmother to be in a coma and need more money for the cure, Kai begins searching for his brother Kuad. Things turn upside down when the siblings reunite to take their chance in a gambling house to get the money for grandmother.