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With a single thought, his young best friend lost his life, and he was haunted by guilt for the rest of his life. From an ignorant child to a twenty-eight-year-old man, the protagonist pursues the murderer persistently, just to comfort his deceased friend, but he is killed by the murderer in the final battle. In a twist of fate, he returned to the ten seconds before the tragedy happened. The truth that had never been seen through in the previous life came to light. The brother who accompanied him every day turned out to be a tomboy hiding his daughter's identity. Returning with all the pain and regrets in his previous life, this time he broke through the prison of fate, stopped the fatal murderous intention, made up for the debt he owed back then, and protected the old friend who should have had a beautiful life.