1. Episode 1

Chanmi transfers to her twin brother's school to find out the truth about his suicide.

2. Episode 2

Chanmi learns a shocking truth of a different life that her brother lived.

3. Episode 3

Sooheon punishes Sa Jungkyung and is called a hero by the students, but Chanmi grows suspicious.

4. Episode 4

There is a scheme to kick Chanmi out of school, and Sooheon advises her to leave.

5. Episode 5

Wonseok's case is reclassified as a homicide. Chanmi learns of Wonseok's lie to her.

6. Episode 6

Sooheon finds himself in a predicament as he becomes number one suspect of a murder.

7. Episode 7

Chanmi gets an unbelievable call, as she holds Sooheon at gunpoint.

8. Episode 8

Chanmi and Sooheon are convinced that Gi Osung is Wonseok's killer.

9. Episode 9

Sooheon revisits Sa Jungkyung's camping car, but it is a trap.

10. Episode 10

Osung feels betrayed as his plan fails. Chanmi makes a shocking discovery as she sets up a trap.

11. Episode 11

Jaebum regains his memories, but Sooheon is unfamiliar with this version of Jaebum.

12. Episode 12

As truths emerge, the time for the final revenge has come.