Bucky Barnes captured in hydra back in the 40s, studied to have caused dozens of assasinations over the course of a century. Controlled by HYDRA and The Red Room. Bucky was rescued by Steve, being taken to the compound to help heal him, shortly after you were introduced in the compound, same reason.. To heal. the compound had two rooms, isolated from all the other ones, like a bedroom, with a bathroom that connected the two rooms, and of course u and Bucky used it. But he hates your guts..badly.