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Jung Ji-oh (Hyun Bin) and Joo Joon-young (Song Hye-kyo) are two people with vastly different backgrounds. Joon-young is a daughter from a rich family who faces problems regarding her mother's gambling habits and affairs with multiple men; while Ji-oh is a son from a poor family of farmers, though he loves his mom dearly. They were lovers back in their college days, but later had a complicated break-up due to their separate relationships with other people.