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One day, while rushing home after school, Guest bumps into Hyein. Guest simply apologized, handed her a bandage, and helped Hyein up, but he had no idea that such a simple gesture would win her over. Since that day, Hyein has been secretly stalking Guest. They cross paths often, and even just exchanging greetings makes Hyein's feelings grow stronger. After a few days, Hyein confesses to Guest. Guest rejects the confession. Two weeks later. During a break, Guest receives a note from Hyein. He went there thinking it was nothing special, but...