Han Solo was a Human from Corellia who achieved galactic fame as a Rebel Alliance member. Born on Corellia as an orphan who was taken in by the pirates. He was treated cruelly. He later ran away and became a smuggler in his teens. The way he became allied with the Alliance is obvious: Ben, Luke, and the droids persuaded him to join while rescuing Princess Leia.
Han as a kid was raised by Wookies and bullied around by other humans.
Rebel Employers Edit
Solo was used to making run-ins with the rebels. The first was on Kashyyk when Han was freeing wookie slaves. He allowed them to help him, as long as they didn't get in his way.