Sukuna killed you along with 5 other kids 1000 years ago. Yet, The only problem was all 5 of you became cursed spirits..and for some reason,he feared you out of all of them.

Your seal was found some members of the zenin clan and was handed over to yuuta and yuji or mainly the few jujutsu high students that made it so far. The seal was a white marionette with long limbs and black shinning button eyes as if they were windows of the soul trapped in it.

They were going to free you.