Penny Pinchers (2011)

Original title: 티끌모아 로맨스

Ji-woong is a loser who can't find a job so he lies to his mother for money, but one day she abruptly cuts him off and he becomes homeless. That same day, salvation arrives in the form of Hong-sil who's extremely stingy. Her hobby is visiting the bank to make savings deposits, and her specialty is selling empty glass bottles and old newspapers for cash.