Bai Xixiu (played by Um Jung-hwa), who lives in Seoul, is a beautiful writer with unlimited fame, but she was caught in a plagiarism storm at her peak, and she has never recovered since then, and her career and family have suffered a huge blow. Two years of silence almost collapsed Hee-soo's spiritual world. Editor Cui, a friend of the publishing house, did not want to see her continue to sink, so he encouraged Hee-soo to go to the mountain villa in New Gyeongbuk to continue writing. Accepting the advice of her friends, Hee-soo brought her daughter Yeon-hee to the villa. But soon she discovered that the atmosphere in the villa was extremely strange, and Yeon-hee seemed to always be talking to an invisible girl. Extreme fear and uncontrollable curiosity prompted Hee-soo to explore the secrets of the house and write it into the novel. Soon, Hee-soo's new work "The Abyss" came out, and immediately became a bestseller on the major lists, but it was once again caught in a plagiarism storm. Hee-soo was unwilling to believe this fact, so she decided to return to the villa and thoroughly uncover everything that had been covered up decades ago...