1Bye, Friends
High school girls Lee Eun-bi and Ko Eun-byeol live miles apart and their experiences are vastly different, yet they share an uncanny resemblance.
2Sara
After ten days of frantic searching, Eun-byeol's mom receives a call from the hospital, where she learns her daughter doesn't remember anything.
3Start Anew
Yeong-eun's mom demands an investigation for the recent incident and alleged bullying, but the situation is complicated by Eun-byeol's amnesia.
4I Thought of You
Eun-bi tries to find out what happened to Eun-byeol. After discovering a letter in her daughter's room, Eun-byeol's mom hurries to the House of Love.
5I Pity You
Eun-bi's confusing life is further complicated by a new transfer student, who keeps wanting to hang out with her group of friends.
6Never Forget
So-yeong schemes relentlessly against Eun-bi. Tae-gwang pretends not to be concerned despite being secretly worried about Eun-byeol.
7I'm Not Afraid of You
Eun-bi resolves to be more like Eun-byeol and stands up to So-yeong. I-an offers to help, but Eun-bi can't get herself to tell him the truth.
8Don't Think Too Much
Three teams in Eun-bi's class fail to turn in their group projects after someone tampers with their computers. Eun-bi suspects So-yeong.
9I Am Not Eun Byeol
I-an goes to see Eun-byeol's mom to ascertain what happened to Eun-byeol. During I-an's absence, Tae-gwang and Eun-bi grow closer to each other.
10It's Because of Me
Feeling responsible for I-an's injury, Eun-bi tries to help him, but he pushes her away. So-yeong enlists her mom's help to get out of a tight spot.
11Transfer Her Out
Eun-byeol's mom sees her daughter confronting another student. Tae-gwang tries to help Eun-bi from being forced to transfer to another school.
12Su In's Death
While checking the school's security footage, Mr. Kim spots something shocking. Tae-gwang discusses Eun-byeol's situation with his father.
13It's Been Awhile
So-yeong threatens to reveal the results of the handwriting analysis in front of the class. Tae-gwang senses something very different about Eun-bi.
14I Will Resign
Eun-bi is caught between two places she considers home. I-an has mixed feelings for Eun-bi. Tae-gwang ponders what to do with the autopsy report.
15Final Goodbye
I-an tells Tae-gwang the real reason why he was angry at Eun-bi. While trying to repair her phone, So-yeong remembers the video that she took before.
16I'm Sorry
Eun-bi's family decides to move and start afresh. Eun-bi makes her feelings known to Tae-gwang and I-an, and Eun-byeol says her goodbyes.