Хто ти: Школа 2015

Eun Bi is a Nuri Girls High School student in Tongyeong; although schoolmates bully her, she doesn't let anyone know and endures it; Eun Byeol and her friends go on a field trip to Tongyeong.

Mi-kyung remains in Tongyeong to search for Eun-byeol; So-yeong sees Eun-byeol and tries to bully her again, but Mi-kyung stops her.

Eun Bi loses all her memories and ends up living as Eun Byeol; young Eun loses her mother's necklace, but it appears in Eun Bi's locker; Ian helps Eun Bi so she can regain her memories, and Eun Bi also starts to adapt herself to Eun Byeol's life.

Eun Bi regains her memory; she is sad that she is no longer Eun Byeol at Segwang High, but she decides to leave her school and home; So Yeong, who bullied Eun Bi in Tongyeong, transfers to Segwang High.

Tae-gwang develops a crush on Eun-byeol; I-an fails to tell Eun-byeol what is on his mind and just leaves the medal behind out of jealousy.

So Yeong tries to put Eun Bi in danger as she turns her friends in class three over to her side; Ian wants to help Eun Bi to find her memory, but she refuses Ian's favor as she believes that she is not Eun Byeol, which makes him sad.