A substitute teacher's body is found dead. Ms. Lee is responsible for the reconstruction of that place.
The autopsy shows suffocation. Su Jin's case turns into an investigation under the ruling of murder.
Ms. Lee fills Tae Hwa in on Su Jin's relationship with Myung Won. She uses the security recording after.
Man Rae admits to killing Su Jin. The DNA match shows something from what's found in Su Jin's nails.
