After enduring countless hardships in Riddle City, Haohao finally defeated the Great Book-Eating Demon King. With the help of Judge Red Pen, they embarked on a journey to Fairy Tale City through a secret passage. Along the way, the Great Book-Eating Demon King set traps for Haohao and his companions. Bravely facing each challenge, Haohao overcame them one by one. Just as they were nearing Fairy Tale City, due to another careless mistake—misreading the idiom "瞠目结舌" (stunned and speechless) as "堂目结舌"—Haohao fell from the idiom ladder and accidentally stumbled into Wordless City. In Wordless City, the Great Book-Eating Demon King laid an inescapable net with his army of Wrong-Word Guards, awaiting Haohao and his group. Upon arriving, they encountered the director of Circle Hospital, who had already been turned into a trash can by the Great Book-Eating Demon King. Director Circle told them that to eliminate the Wrong-Word Guards, they must use three treasures to repair the Wrong-Word Correction Machine—only this machine could eradicate the troublesome Wrong-Word Guards. The first treasure is the All-Purpose Correction Fluid held by the police chief of Riddle City; the second is the Crystal Treasure Flower from Dream Snow Mountain; and the third is the Magic Pen from Star Forest. After countless trials and dangers, Haohao and his companions finally gathered all three treasures, engaged in a decisive battle against the Wrong-Word Guards of Wordless City, and emerged victorious.