When college freshman Anna Tran is murdered while jogging home one night, an alien lifeform body-snatches her corpse and tries to catch her killer, all while attempting to keep Anna's fate a secret from her classmates, friends, and loved ones.

Prologue webcomic: https://www.webtoons.com/en/challenge/who-killed-my-body/list?title_no=466937

(This comic depicts the first two chapters of the web novel. Reading the comic isn't necessary for understanding the story, but may help with visualizing the main character.)