Han Se-Joo (played by Yoo Ah-In) is a writer who was once very popular, but after the initial glory, he fell into the trough of his career. Not only that, there were all kinds of strange events around Han Se-Joo that puzzled him, and these events were inextricably linked to his career Waterloo. What Han Se-Joo didn't expect was that a book with his own name was published and launched, which received a hot response, but he, as the nominal author, knew nothing about the book. After careful investigation, a shadow writer named Yoo Jin-Woo (played by Go Kyung-Pyo) surfaced, and what was even more shocking was that Yoo Jin-Woo turned out to be a ghost. It turned out that everything started with the antique typewriter owned by Han Se-Joo. This typewriter with a mysterious past also involved Han Se-Joo's fan Tian Xue (played by Lim Soo-Jung) in a century-long fate.