The disturbing details pertaining to the murder of first-year high school student Yoon (15) is sending shockwaves across the country.

Three 15-year-olds and a 24-year-old were arrested for Yoon's murder while a 25-year-old, 24-year-old, and another 15-year-old were taken in as accomplices. �

Yoon had run away from home with Kim (24) and was forced into prostitution to pay for living expenses at a motel in Busan.

After the defendants found out Yoon's father had filed a missing person report on March 29, they sent her back home to assure him that she was fine. However, the three defendants were scared of getting caught for prostitution and persuaded Yoon to come back the next day. They picked her up at a church she attended and took her to a motel in Ulsan. Yoon continued her services as a prostitute.

On April 4, Yoon used the hotel computer to log into her Facebook account, accidentally revealing her location. The three blamed her for revealing their whereabouts and physically abused her.

They forced her to drink two bottles of soju. If she threw up, they forced her to eat her vomit, as well.

The abuse became worse over time. When Yoon complained of being hot and asked for water to be thrown on her, they poured boiling water several times over her arms and body instead.�

The defendants forced her to sit and stand up 100 times, even though she was injured. They beat her each time Yoon said she wanted to go home.

Yoon was eventually discovered dead in the back seat of a van outside the motel from a heart attack.

However, the crimes continued even after her death. The group decided to bury the body in the mountain. They poured gasoline over Yoon's face before setting her body on fire so her face wouldn't be recognized. They then made a concrete mixture and poured it over the body along with rocks and dirt.

Yoon's father (50) was at a loss for words regarding the horrific crimes. He said he couldn't forget what his daughter told him while crying in fear when she came home momentarily. "She confessed that she was abused while being forced into prostitution. They fed her once a day and she was worried that they would come looking for her again," he said.

Currently, four of the current defendants are being held in a detention center, and three are being detained in a jail in Changwon.�