3-Iron (2005)

Tae-suk (Jae-hee) is a lonely drifter who spends his nights in one empty vacation home after another. However, Tae-suk is not your usual squatter, as the courteous young man always makes sure to show his absent -- and unknowing -- hosts his gratitude by doing small household tasks or making simple improvements before moving on. One day, Tae-suk mistakes a quiet home for an empty one and stumbles across an abused housewife (Seung-Yun Lee) in urgent need of his intervention.