The author, Tran Ngoc, delves into the intriguing mystery of the Hùng Kings' extraordinary lifespans in Vietnamese history. Historical records suggest the first Hùng King was born in 2879 BCE, and the eighteenth died in 258 BCE, implying an average lifespan of 145 years, with some, like Long Quân, living for over 500 years—a stark contrast to modern human lifespans. This anomaly led 18th-century scholar Ngô Thì Sĩ to question, 'Humans are not made of gold or stone; how could they live so long? This is truly incomprehensible.' This novel explores the hypothesis that ancient people possessed methods to extend their lives, suggesting that immortal cultivation (tu tiên) was a reality. Inspired by the Hùng Kings, this is a work of fiction, not a historical account; any resemblance of characters or locations to reality is purely coincidental. The author apologizes for the use of many Sino-Vietnamese terms and unpolished prose, as they are not a professional writer. For clarity, the martial arts system begins with the Mortal Realm (Phàm cấp), where 1 Ox Strength (Ngưu Lực) equals 1000 cân. This realm has six levels: Đản Trung, Linh Đài, Hợp Cốc, Quan Nguyên, Dũng Tuyền, and Mệnh Môn, each granting increasing strength and lifespan (from 150 to 600 years). The Immortal Cultivation Realm will be unveiled later. Martial arts and weapons are graded from One-star to Nine-star.