In the web novel 'I'm Not the Mastermind,' the protagonist struggles to convince others of their innocence despite playing only minor pranks. The story unfolds with the protagonist asserting, 'It's true. So why does no one believe me?' Set in a fantasy world, this Korean web novel combines elements of action, adventure, drama, and romance with themes of school life and the supernatural. Tags like 'Overpowered Protagonist,' 'Magic,' and 'Fantasy Creatures' add to the intrigue of this tale of misunderstandings and a protagonist strong from the start.