Fics like (it takes) just a vial

It was a popular belief that Kim Chaehyun likes her best friend Kawaguchi Yurina. Taking her chances, Gryffindor Seo Youngeun who has a crush on Hufflepuff Kim Chaehyun decides to use "polyjuice potion" to copy Kawaguchi Yurina's appearance so she'll be able to talk to her. And in that talk, a secret was revealed.

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