[AI Generated] The protagonist returns through time travel and leads the entire human race to practice martial arts to resist the invasion of monsters in the future. Martial artist level: 1st to 9th level warriors, (7th to 9th level is Grandmaster, 9th level is also called the most powerful) and 9th level and above are Martial King, Martial Emperor, Martial Emperor and Martial Saint. (Adapted from Doraemon's "Change of Ten Thousand Clans")
