Seven First Kisses

Season 1, Episode 5: I'm Your Teacher, You’re My Student

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Soo Jin is shocked when she finds she can speak and understand Chinese fluently while helping customers at work. This in turn makes her curious about who she'll meet next -- but she doesn't expect the handsome Kai to be someone she had seemingly tutored in the language and who also has romantic feelings towards her. (Source: MyDramaList)