On Homecoming Day, Myungjoon discovers an old cassette tape with recordings of his past diary entries. Hoping to correct his mistakes, he revisits pivotal moments in his life, but his actions trigger uncontrollable consequences. Trapped in an endless time loop, reality distorts as he desperately tries to rewrite the past. His obsession drives him to horrifying extremes—murdering loved ones and risking his own life. As he battles forces beyond his control, he questions the blurred boundary between dreams and reality, echoing Zhuangzi’s The Butterfly Dream, and confronting the inescapable nature of karma.