Alex lived a tragic life and died. When he opened his eyes, he was back in his childhood. He had retained all his memories from his past life and got a chance to live his life once again. With the experience and knowledge from his previous life, Alex vowed to stop all the crimes and tragedies he had witnessed before they occurred. He also pledged to win the heart of his love in this life. So, he became a detective who investigates crimes before they happen. By making small and large adjustments, Alex manipulates the future and solves crimes. All the while keeping himself hidden. He has an advantage: he knows the rough location and time of the crimes from his previous life. But it becomes much more difficult when his lover from the previous life starts suspecting him.