Years after surviving horrific abuse in high school, a woman puts an elaborate revenge scheme in motion to make the perpetrators pay for their crimes.
Tormented by her high school classmates and with nowhere to turn for help, Moon Dong Eun sinks into despair before deciding on a new mission in life.
With Park Yun Jin's wedding on the way, Dong Eun's revenge rolls out according to plan. Meanwhile, a fateful encounter at a hospital takes place.
After securing the services of an amateur sleuth, Dong Eun uncovers scandalous secrets that she leverages for the next phase of her scheme.
Already on edge over the past resurfacing, Yun Jin grows more anxious when she learns about her daughter's new homeroom teacher — and of a sudden death.
While Ha Do Young comes across an intriguing game opponent, Yun Jin realizes her deepest secrets are at stake when she tries to intimidate Dong Eun.
Son Myung Oh's sudden absence causes tension in the friend group. Dong Eun finds her trust in Kang Hyun Nam tested.
Dong Eun shares her traumatic past with Joo Yeo Jung, who has unfinished business of his own. A new plan is put in place for Hyun Nam's daughter.
Do Young meets with Choi Hye Jung to find out more about his wife — and her past. Yun Jun digs into Dong Eun's private life.
Questions arise over Myung Oh, Dong Eun gives Yun Jin a chance to come clean about her past, and the circumstances of Yoon So Hee's death are revealed.
Yun Jin threatens Hyun Nam after discovering her involvement with Dong Eun. Yeo Jung devises a way to get the truth out of Yun Jin.
Hye Jung finds an incriminating recording on Myung Oh's tablet, and Hyun Nam receives an unwelcome visitor as she prepares to send her daughter abroad.
Dong Eun's end game comes into focus as she sends Jae Joon a troubling package and orchestrates a plan to take down Yun Jin and Lee Sa Ra.
As Sa Ra and Yun Jin deal with the aftermath of their crumbling reputations, Dong Eun learns the details behind Ye Jung's private struggles.
Yun Jin and Shin Young Joon panic over Myung Oh. Dong Eun takes care of a lingering problem. Yun Jin's mother schemes to remove a threat.
Do Young issues an ultimatum. Dong Eun demands a piece of evidence be handed over. Yun Jin attempts to do damage control after old videos appear online.
As the final pieces of Dong Eun's revenge plot slot into place, she considers what comes next — and what it will mean for Yeo Jung.
