In the eyes of others, Tang Yin is a handsome and smiling young man, but he is actually a professional killer. After saving a barmaid from being raped, he is unexpectedly transmigrated to a chaotic other world. He wakes up in the middle of a battlefield, but this did not make him feel the slightest unease; rather, he was delighted to finally be able to make full use of his true abilities. Ever since, everything about him exists only in legends...