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Chan's envy of Su-jin and Ha-ran grows. As Ha-ran celebrates Chan's birthday, she moves past her "winter" while Na-na makes a choice in Chuncheon.
Chan's unintentional lie about the fountain pen weighs on his conscience. To stay close to Ha-ran, he must decide if the truth is worth the risk.
Ha-ran, who learns Chan's secret from seven years ago through the "1-Inch of Memory" notebook, falls into confusion upon realizing that even the fountain pen was a gift he had prepared.