The Rise of Skywalker vows to be an ending for the Star Wars saga trilogies, but director J.J. Abrams said the movie will also explore beginnings, particularly one that has gone largely overlooked.

It’s not just “Who’s Rey?”—it’s “Who’s Finn?”

For years fans have wondered, theorized, and speculated about the origin of Rey, the scrappy scavenger with unsettling Force abilities played by Daisy Ridley. Where did she come from? Who were her parents? Why does the Force flow so powerfully through her?

Abrams has promised the new film will finally provide some resolution, but in a new interview with Vanity Fair, he revealed The Rise of Skywalker will also explore another mystery: What is the origin of Finn, the young man who decided to pursue a more heroic destiny than “stormtrooper”?

Played by John Boyega, First Order soldier FN-2187 received the nickname Finn from Oscar Isaac’s Poe Dameron when he decided to help the Rebel pilot escape from captivity. But how did he become a soldier for the dark side in the first place? All we know now is that Finn was conscripted as a child and raised with no knowledge of his home or past.

After two movies proving who he is, this time he will discover more about who he was.

“It is part of the story of this one,” Abrams said. “And it was alluded to in Episode VII, but there’s a bit more light shed on that in this one.”

In The Force Awakens, Finn was motivated by his conscience, and no amount of brutal training could erase that from him. In The Last Jedi, he simply wanted to escape war altogether, but the admiration of Kelly Marie Tran’s Rebel engineer, Rose Tico, helped inspire him to keep fighting for what’s right.

Although Rey’s origin story was hyped as the central mystery of the new trilogy, Finn’s background was also left hazy on purpose. Boyega told Variety in 2015 that he had devised some “conspiracy theories” about his character, and Abrams said audiences will find out the truth when the new film opens on December 20.

“I would say that each of the characters get more light shed on their histories,” Abrams added. “I’m not saying we get full, exhaustive downloads on all of their childhoods and every major step that got them to where they are. But there are a lot of questions about Finn’s past, about Poe’s past, obviously Rey and Kylo, and then some of the new characters we meet.”

The director, who cowrote the script with Argo Oscar winner Chris Terrio, said that after stoking curiosity for two movies, it’s time for answers.

“We went into this movie very much in the mindset that this has to be conclusive,” he said. “It has to. You have to get some answers. You have to learn some things.”

The challenge is living up to expectations, since fans have spent this time constructing elaborate theories. “For me personally, the fun of it is the excitement of what comes next, what comes down the line,” Abrams said. “It makes beginnings tantalizing and exciting because hopefully the audience will feel the same feeling you have, which is, Ooh, I think I know where this is going. Let’s see how we get there.”

From Luke Skywalker wondering about his supposedly deceased Jedi father, to Rogue One’s Jyn Erso’s uncertainty about her scientist dad, and even Han Solo’s status as an orphan in his stand-alone film, Star Wars has always been about using the lens of galactic fantasy to explore who we are, where we come from, and how we might break from the strictures of the past. Abrams said he kept this in mind while creating the finale to the Skywalker saga.