My Dear Enemy (2011)

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Jobless and single in her thirties, Hee-soo is miserable. On one fine day, she sets out to find Byoung-woon, her ex-boyfriend. It is not love that brings them together but $1,000 Hee-soo had lent to Byoung-woon a year ago. Byoung-woon is also penniless but surprisingly happy for he knows the girls who are willing to give him money. Afraid Byoung-woon may run off before clearing his debt, Hee-soo follows him as he visits many girls to borrow money, so the two ex-love birds set out on a one day journey to collect money, and memory.