Instead of Seo Won's memories, Hae Na's memories of him get erased, making Seo Won despair. Seo Won does his best to win Hae Na's heart again, but it doesn't go as well as he expected. However, Seo Won finds out that Ji A still has memories of him and Hae Na dating. Meanwhile, Ji A visits the mountain where she died in her past life, which upsets Bo Gyeom.

After finding out everything about the curse and their past, Hae Na and Seo Won realize how they feel about each other. One year has passed, and Seo Won's birthday is only ten days ahead. Hae Na wants to give him a present that is unexpected but meaningful. She prepares a special present and plans to give it to Seo Won at the school festival. However, an uninvited guest appears at the school.