Realization and courage made Mok Hae-Won (Park Min Young) confess her love for Im Eun-Seob (Seo Kang Joon). Upon hearing the words, Eun-Seob was at a loss for words. And in the end, he only uttered the word "okay."

Jang-Woo appeared at the scene and called the two to join them. Eun-Seob then ran towards Jang-Woo and left Hae-Won shocked as things turned out unexpectedly. She thought that Eun-Seob liked her.

Heartbroken, Hae-Won felt sick when she reached her house. The following day, Hwi (Eun Seob's sister) met Hae-Won and encouraged her not to feel down if Eun-Seob rejected her. Jang-Won passed by and asked her to join them going back to their school to clean.

After the clean-up, she went to the bookstore. Eun-Seob met her outside and asked why she's there when it's her day off. Smiling, Hae-Won asked her about the key chain in his car. She wanted to know if that was her gift back in high school. Eun-Seob disagreed and told her that he made it himself.

Bo-Young then arrived and asked Eun-Seob if the bookstore is open. Eun-Seob told Bo-Young to get inside and wait for him. Hae-Won hid her disappointment and bid goodbye.

Bo-Young asked Eun-Seob to share what he knows about the book she was reading. That night, Hae-Won stayed in her room without dinner. When she woke up the next morning, the phone rang and she picked it up, only to hear Eun-Seob tell her to not go to work for the next three days or until he said so.

Hae-Won was surprised by his advice. Out of frustration, she went to the bookstore and looked for Eun-Seob. She could not get inside since the doors are locked. She came home furious and told her aunt how much she dislikes the dog.

Eun-Seob canceled the special club meeting that night. Words reached Hae-Won that Eun-Seob was sick. His mother came and picked him up to stay in their house while he was sick. She prepared herbal medicine. Eun-Seob did not want to drink any medicine or see a doctor. His mother felt sad as she talked to her husband. She said she does not want to lose Eun-Seob like what happened before. Eun-Seob went away for three years and came back home to enlist in the army.

Jang-Woo heard of his friend's illness. He went to Eun-Seob's house to visit and brought food. He looked for Eun-Seob in his room but he wasn't there. His mother got worried and wanted to look for Eun-Seob in the forest. Jang-Woo met Hae-Won and told her about Eun-Seob's sudden disappearance.

Later that night, Hae-Won asked Hwi if her brother came home. Hwi said that Eun-Seob did not return and maybe will spend the night in the forest. In desperation, Hae-Won bravely walked alone in the forest. She looked for Eun-Seob alone. Hae-Won reached the old cabin in the forest. She shouted his name but to no avail. She searched for the dark house but Eun-Sub was not there.