I Became the First Prince: Legend of Sword's Song

Tags: Accelerated Growth, Adventurers, Appearance Changes, Appearance Different from Actual Age, Army Building, Arrogant Characters, Betrayal, Body Swap, Body Tempering, Calm Protagonist, Cheats, Death of Loved Ones, Dense Protagonist, Dragon Riders, Dragon Slayers, Dragons, Dwarfs, Elves, Empires, Famous Protagonist, Fantasy World, Fat to Fit, Firearms, Game Elements, Game Ranking System, Goblins, Gods, Handsome Male Lead, Hard-Working Protagonist, Harsh Training, Hated Protagonist, Imperial Harem, Kingdom Building, Kingdoms, Knights, Leadership, Level System, Loyal Subordinates, Magic, Male Protagonist, Monsters, Nobles, Orcs, Overpowered Protagonist, Past Plays a Big Role, Personality Changes, Poetry, Possession, Previous Life Talent, Reincarnation, Royalty, S*ave Harem, Sharp-tongued Characters, Strategic Battles, Sword And Magic, Sword Wielder, Wars, Weak to Strong