A Promise (2008)

Kang is a spoiled and rebellious city kid. When his mother travels overseas and leaves him with her father, Old Mo, Kang is quick to come into conflict with his old-fashioned grandfather and his shabby living conditions. No matter how spoiled and unreasonable Kang is, Old Mo remains forgiving and patient. Through his grandfather's boundless patience and devotion, Kang learns to embrace humility and cement the unyielding bond between grandfather and grandchild, by fulfilling a long-forgotten regret of Old Mo.