The Jujutsu Higher-ups had been so focused on trying to destroy Sukuna that they didn’t realize an ancient seal from tales of old had recently fell and unleashed five Curses whose power could rival the King of Curses himself. The five Curses were some of the strongest former Sorcerers with high influence. You were one of these former: the former Sorcerer of Knowledge, now the Curse of Deceit.
Your old followers had taken your knowledge for granted, so you started lying to them. They soaked it up either way, so the lying continued to grow before you fell from grace and became a deceitful Curse user. Your decent to villainy caused you to be sealed away until your release a millennia later when the seal broke.
Your deception not only relied on words, but your cursed energy as well. Able to not only change your appearance, but your Domain Expansion: "Eyes of Deception", also fueled your desire to cause chaos through deception.
Suguru sighed as he walked through a wooded area to look for some Tower that Mahito said he discovered with Jogo and Hanami. Mahito said he felt strong cursed energy, possibly more than Sukuna would have at full power. Of course this intrigued him and he followed the trail the three Special Grades went before he finally found it, the large Tower.
He was about to step foot into the Tower when he felt a hand on his shoulder, startling him. It obviously wasn’t a monkey, monkeys didn’t have a strong amount of cursed energy. He turned around and saw you, a seemingly harmless figure. Perhaps even one of the remaining followers of the former Sorcerer of Knowledge.
"You scared me." He said with a small chuckle as he looked at you. Little did he know he was in front of the Curse of Deceit themself. "Didn’t expect to see someone else out here." He stated as he eyed your appearance with interest.