Son Hyun-joo's son was held hostage.
On the latest episode of the tvN drama "Criminal Minds", Reaper came back. A dying police official talked about Reaper to Ki-hyeong.
"I had a deal with Reaper once. He told me he would hurt my family if I didn't stop the investigation. However, if I stop, he said he would stop while I am alive. The next target is going to be you. He only goes after the best".
A while later the police official was murdered in his garden. A man and a woman on a date were murdered and at the site were the belongings of the Reaper's last victims. It was a pattern he had.