According to the actor very few people were privy to Jon's return, but costar Sophie Turner especially knew nothing!
The 29-year-old stopped by This Morning on Thursday and remembered his on-screen sis was ‘furious' after she found out Harington really was coming back to the acclaimed HBO fantasy series — because she wrote him a heartfelt letter saying goodbye!
Speaking to Holly Willoughby and GoT superfan Phillip Schofield, he revealed:
"Sophie was a little furious about that [coming out]…It was so sweet. It was such a heartfelt letter, [it read] 'I loved working for you', [it was] a really long letter. An adorable letter, and it made me laugh so much. And even after she gave it to me, I didn't tell her [about Jon]. I read it and said, 'Thank you so much for the letter'."