Gaeinjeongbo Jegong-e Dong-uihasibnikka?

One day, Hyeon-soo suddenly remembered a small relationship in his life. Curious about the person's safety, he joins social media for the first time in his life and comes to contact him. And until the meeting... After a short meeting with that fate, strange things start to happen to Hyeon-soo. Hyeon-soo's normal daily life is gradually crumbling as terrorist attacks that can only be done by knowing his personal information occur one after another... Will Hyeon-soo be able to catch the criminal and restore his daily life?

(Source: Naver; translated)