Haseo is a fictional character from the video game series The World and its sequel The World R:2. He is known for his role as a player character in the MMORPG (Massively Multiplayer Online Role-Playing Game) setting. Haseo starts as a novice player but evolves into a powerful figure known as the "Terror of Death," seeking revenge against those who wronged him. Haseo's character design features a distinctive black and red outfit, symbolizing his dark and vengeful nature. Throughout the series, he interacts with various characters, including Shino, a key figure in his quest for redemption. His journey explores themes of friendship, betrayal, and the impact of virtual worlds on real-life emotions.