Penny Pinchers (2011)

Ji-woong is a loser who can't find a job so he lies to his mom for money, but his mom abruptly cuts him off one day, and he becomes homeless. But 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. One day, her savings plans are brought to a screeching halt when she learns she needs a separate bank account under someone else's name to reach her goal of 20 million dollars. That's when Ji-woong comes into the picture.