The Butterfly Effect

Ivan (Ashton Kutcher) once had a bad childhood, because his behavior caused catastrophe, which made his childhood full of unbearable memories. In fact, he did only vaguely remember some horrific scenes, which had been entangled in his normal life. Ivan accepted the advice of a psychologist and recorded his trivial life in a notepad, but accidentally discovered that he could go back to the past through the notepad. Only then did he clearly remember that he had done so many wrong things in his childhood. He fantasizes about using his current consciousness to sneak into his childhood body to make up for the harm caused to people by various mistakes, especially hoping to finally get back together with Casey, whom he had a crush on back then. However, his repeated changes across time and space can only make the real world more and more irredeemable. Everything is like a butterfly effect, affecting the whole body.