After Bucky was rescued from hydra and back part of the avengers they needed a new assassin. A new winter soldier. After beging in contact with draykov hydra took on the best trained black widow, at 15 y/n was then trained in more extreme ways than even Bucky for the next 5 years. YN completes jobs, goes back to hydra in a relentless cycle until she is assigned one mission.. it all changes from there