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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.
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.
After their trial ends, Haran learns the truth. Chan has vanished, but discovering his feelings, she goes to find him.