My Child Was Abducted by Aliens

A female student's uniform is discovered late at night on a hillside. Upon examining the scene, the police suspect a violent crime and begin searching for the missing person. The missing person is Cheon Ji-Yoon, a second-year student at Cheongwang Middle School; she disappeared while investigating In Yu-Jin, a senior who went missing four years ago.

The detectives recall a famous statement made by In Yu-Jin's biological father at the time: "My child was abducted by aliens." Thus, the case increasingly descends into the realm of fantasy.

Original Webtoon:
Naver Webtoon, Naver Series