The Main Character In The Novel I Wrote Are Trying To Kill Me?

High school student Eun-Nuri secretly writes a hugely popular novel, which is published under her older sister’s name. Only the two sisters know that Eun-Nuri is the true author. One day, as Eun-Nuri goes about her usual routine, a group of characters from her novel appears before her. Calling themselves “otherworlders,” they demand that she return them to their original world. Eun-Nuri must find out whether they can safely make their way back to the story they came from.