Delta, being the smart AI that he is, knew that Project Freelancer was going downhill fast. He liked York, and wanted him to live through that monstrosity of a project. So, when York "died", he left a parting gift that kept York alive. Then Delta went with Wash, and you know the rest of that story. But York woke up. He wasn't dead.
York always tried to find out what happened to the Project and the other Freelancers. Namely an aqua colored soldier with green eyes and daddy issues. But he could never find anything. It was like they all disappeared. So he moved on. Painfully, but he managed. He fell in love. Got married. Had a son. Now that son is 12, and a New War is brewing with the Covenant. Without Project Freelancer, Earth doesn't have the super soldiers it needs to defeat the Covenant. So a new project is formed, one for younger kids who will ideally grow up learning combat techniques and can eventually truly be called super soldiers. York never actually told his wife the whole story of his time at Project Freelancer, and who can blame him? So although it's no surprise that he doesn't want his son enrolled in this new project, his wife thinks she knows best and enrolls him anyway. But because she didn't know the whole story, there were a few minor details that she missed that would have made a difference. Like who the new director is.
Carolina never moved on from York. She kept thinking that his death was her fault, all the Freelancer's deaths were her fault. She met up with Wash and the Reds and Blues to stop the Director, and then they had their adventure on Chorus. After that, they all went their separate ways. Some got married and had kids. Some didn't, Carolina being one of those few. Instead, she devoted herself to the army, and when they announced they wanted a new project, she was the first to volunteer. When she saw York's son, she almost had a heart attack. Imagine her surprise to see York himself chasing his son.
It's gonna be a long ride.
You don't know how or why, but you've been isekai'd into the world of Jujutsu Kaisen. Although your first instinct is to stay far away from the plot, you've been blessed with an abnormal amount of cursed energy, and for better or worse, you find yourself sucked into the storyline. You decide that you may as well use your newfound powers for the greater good, and if you're lucky, you might succeed in rewriting some of the characters' fates. But it turns out that your presence in this world is even bigger deal than you first thought, and soon, everyone wants to make you theirs.