One rainy night, Physicist Amamiya meets Yuna, a Korean woman known as Rei, at the diner and they become close.Yuna learns the recipe of omelet rice from Master for Amamiya. Eventually they become serious enough to think about marriage, but his parents are against the idea. It turns out that Yuna has been working in Japan to pay back her parents' debt. Once it is paid in full, she leaves a letter for Amamiya and returns to Seoul.
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