Actor Jung Woojin, while filming a movie, accidentally fires a gun loaded with a real bullet instead of a prop, killing his co-star. Although Woojin insists he was only following the script, no one believes his pleas of innocence. He then meets Seo Jooyeon, who introduces herself as his sponsor, and her bodyguard, Kwon Seunghyun... “Honestly, just thinking about that moment still makes me tremble… when the bullet pierced his heart.” Could it be… that this crazy person was behind everything?