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“Cha Woo Jin, let’s get married.”
“Are you crazy?”
“If neither of us are taken by the time we are 29, let’s get married.”
In Ah and Woo jin are childhood friends. They have never had any romantic feelings towards each other until one night In ah proposes to which Woo jin feels the situation is absurd, but he begins to unconsciously count down the days to her birthday.