Stepmother who ran away from home 5 years ago... Skeletons discovered in septic tank (Korea)

The case is attracting attention again after a skeleton was discovered in a septic tank at a villa in Gunsan, Jeollabuk-do, about 10 years ago.
According to JTBC on the 4th, the body was discovered in a septic tank in a residential area in July 2013. At the time, workers were opening the lid of the septic tank and removing waste when they found a white
An object caught my eye. I thought it was a dead animal, but on closer inspection I could see it was a rib and a femur - clearly human bones.
According to an examination by the National Forensic Service, the bones were found to have been found four to five years after the death.
They collected DNA samples from family members of the missing people in the area and quickly identified the skeleton as that of a woman in her 80s who lived in a house right in front of the septic tank. The DNA matched that of her grandson.
The woman went missing in November 2008. She lived with her son and his wife, but the couple did not search for her missing mother.
At the time, her daughter-in-law, Kim, said, "I went out and when I came back, my mother-in-law was gone. Her clothes were gone, and she had only taken about 2 million won (about 220,000 yen) in cash."
When the police showed Kim the DNA request form, he confessed to killing his mother-in-law and abandoning her body.
The woman's son worked far away and only came home occasionally, so the mother left the house.
He believed his wife's words. When his mother-in-law, who was suffering from dementia, was cleaning up the toilet, he said to her, "Is she out late because her husband is not here? Is she cheating on you?
Kim claims that she was so angry that she pushed her mother-in-law, causing her to hit her head on the threshold and die. Scared, Kim dumped her mother-in-law's body in a septic tank that night.
"I should have reported it immediately, but every day was like hell," Kim said, adding, "I feel relieved now."
Kim was sentenced to three years in prison for assault resulting in death and abandoning the body.