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A high school substitute teacher\u2019s dead body is found in the garden in front of her apartment. However, people are more worried about its impact on their property value than the fact that someone has died. Miss Lee, who is responsible for almost all affairs related to this very apartment\u2019s reconstruction, is questioned by a police officer. After questioning witnesses surrounding the death of a high school teacher, Yang Su Jin, Ho Chul still feels that there is a missing piece of the story.

With the autopsy showing death from suffocation, Yang Su Jin's case turns into a murder investigation. Two suspects are on the list, Seo Tae Hwa and Im Jung Kwon. However, the police don't have any hard evidence to arrest anyone yet. Meanwhile, Goong Bok gets Tae Hwa out from police custody for attacking Lee Myung Won.

Miss Lee fills in Tae Hwa on why Su Jin had a relationship with Lee Myung Won. After seeing and hearing Myung Won and Ho Chul's conversation on a home CCTV recording no one knew about, they now know that Myung Won and Ho Chul are related. Later, Miss Lee uses the home security recording to set things straight with Ho Chul before they both scramble to find Yang Su Jin's phone.

Bong Man Rae admits to killing Yang Su Jin and takes his wife, who is suffering from dementia to the water's edge. After sharing their last words, he drives into the water. Meanwhile, Ho Chul receives a call confirming a DNA match from the sample he requested and the DNA found under Yang Su Jin's nails.