"Sex, sex, sex... What's the big deal about sex?!" Gyuri, a native of Jeju island, is only interested in turning her cafe into a big brand. But her happy daily life is suddenly disrupted by a rude customer criticizing the taste of her coffee, calling it 'dishwater'. Certainly, this was her worst encounter with a stranger... until she saw him naked. In the end, Gyuri wasn't able to sleep and ended up masturbating for the first time...