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

Chan-mi learns a shocking truth of a different life that her brother lived.

Soo-heon punishes Sa Jung-kyung and is called a hero by the students, but Chan-mi grows suspicious.

There is a scheme to kick Chan-mi out of school, and Soo-heon advises her to leave.

Won-seok's case is reclassified as a homicide. Chan-mi learns of Won-seok's lie to her.

Soo-heon finds himself in a predicament as he becomes number one suspect of a murder.

Chan-mi gets an unbelievable call, as she holds Soo-heon at gunpoint.

Chan-mi and Soo-heon are convinced that Gi O-sung is Won-seok's killer.

Soo-heon revisits Sa Jung-kyung's camping car, but it is a trap.

O-sung feels betrayed as his plan fails. Chan-mi makes a shocking discovery as she sets up a trap.

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