S.I.D. was a Supernatural Webtoon Original created by Sadaham; it concluded on November 27, 2020. The original Korean Webtoon premiered on Naver and concluded on August 19, 2020.
After an incident leaves young Simoon with the ability to see ghosts, his memories are sealed away by his grandmother who wants him to live a normal life. When his sight suddenly reawakens years later, Simoon must use his newfound powers as a member of the special Supernatural Investigation Department, or S.I.D.