Kit Harington
Kit Harington has basically confirmed that the final episode of "Game of Thrones" will make fans cry. Pictured: Harington on “The Tonight Show Starring Jimmy Fallon” in New York City on May 13, 2016. Theo Wargo/Getty Images for NBC

Fans will have to wait until the final episode of "Game of Thrones" airs, likely in 2019, to find out how the show comes to an end, but the cast finally knows what's going to happen—and if reactions from some of them are any indication, then fans are going to be emotional when the HBO series ends its final episode.

In an interview with BBC's "The One Show" (via People Magazine) on Friday, Kit Harington, who portrays Jon Snow/recently revealed to actually be Aegon Targaryen on the series, admitted that the cast all read through the final script last week, and when they finished, he got more emotional than he had initially thought he would.

"We had a read through last week in fact, so I know everything now," he said. "I cried at the end. You have to remember that eight years of it—no one really cares about it more than us."

"It's been an institution longer than any other institution I've been in. School, drama school, anything," he continued. "I get a bit weepy thinking about it. It's going to be a strange year saying goodbye to everyone and having last scenes with this person and that person. Not only you're so attached to it, loads of people around the world are attached to it."

However, despite now knowing everything, including who winds up on the Iron Throne, Harington admits he's going to have be a lot more like his character, who was once told by his former love Ygritte (Harington's real-life fiancée Rose Leslie), that "he knew nothing."

"[I was told] 'Don't tell them you're filming. Don't take pictures in Belfast. Don’t do all of that,'" he admitted. "It's on lockdown!"

The cast has in fact been on a form of lockdown since their arrivals in Belfast earlier this month, because HBO is hopeful they will be able to avoid the leaks that have happened in recent years for the show. With this being the final season, the need to keep the leaks from getting out is higher than ever, and there have been several precautions taken to try and ensure that they don't happen.

In a previous interview with IGN, Liam Cunningham, who portrays Ser Davos Seaworth, revealed that he had all of the scripts for Season 8, but he literally could not read them beforehand due to the securty measures that had been taken.

"I've got them all," he said at the time. "But I can't open them because of all the security, and I can't walk it out."

Nikolaj Coster-Waldau, who portrays Jaime Lannister, also admitted that some extreme measures were going to be taken, telling Scandinavian news show "Skavlan" (via ABC News), that the cast actually wasn't receiving any digital or other hard copies of the scripts in advance this year, and would be fed their lines through ear pieces as they filmed, to prevent the actual scripts from leaking before the season.

"We're not even going to get the script," he said, revealing that after the show's files were stolen during a massive hack on HBO earlier this year, that no one wanted to take the precaution that digital files would be stolen a second time, making the extreme new measures necessary.