In his previous life, he was a "tool man with a gun" who only knew how to practice guns. He died suddenly in the training room at five o'clock in the morning. He was reborn and returned to the beginning of his career - his marksmanship skills were still there, but he had two and a half years of top-level tactical understanding in his mind. From being dismissed as "brainless" to becoming the most feared tactical genius by his opponents.
