Legend has it that the human world was originally silent. Tens of thousands of years ago, the love between an alien boy and a human girl left a favor, and thus the world became sound. People thought it was just a legend. However, the girl who was constantly reincarnated learned the cause after getting the mysterious diary. She was burdened with a double curse in order to find out the truth. She followed the footsteps of the boy from another world and traveled between ancient times, modern times and other worlds. Faced with the hostility of the entire alien world, the invincible and admirable love rival, and the entanglement of interests in the modern world, the girl's pursuit is extremely hard. However, how can she let go of his persistent encouragement and perseverance of true love...