Gobaek

The ultimate revenge.
"From now on, I will refer to them as Suspect A and Suspect B."
Ms. Jang is moving on from teaching after her daughter was found dead in the school pool. Her death was deemed a tragic accident but Ms. Jang suspects otherwise. And before she resigns, she's about to reveal a shocking truth.

(Source: Manta)

Note: Includes 1 extra chapter.