The Main Characters in the Novel I Wrote Are Trying to Kill Me?

High school student Eun-Nuri is the author of a hugely popular novel, but because it was published under her older sister's name, it was a secret between her and her sister that she was the real author. One day, while going about her daily routine, a group of characters from the novel, who claim to be "otherworlders," appear in front of her and demand that she return them to their original world. Will they be able to safely return to their original story world?