XO, Kitty: Gia Kim and Sang Heon Lee Are Siblings

“XO, Kitty” follows Kitty Song Covey (Anna Cathcart) as she travels to South Korea in order to reconnect with a lost love. By the sound of things, the “XO, Kitty” cast quickly developed a close bond — though two of the cast members are actually family members, which was apparently a big surprise for everyone.

It turns out that Gia Kim and Sang Heon Lee, who play Yuri and Min Ho, are actually real-life siblings. In an interview with Teen Vogue, fellow star Minyeong Choi opened up about how the cast found out they were related. “I’m not sure if I’m allowed to say this, but . . . did you know that Gia [Kim, who plays Yuri] and Sang Heon are siblings in real life?” Choi said of the “mind-blowing” revelation. He went on to reveal that the news had come to light when Lee asked if he could add his sister to a cast group text.

“I was like, ‘What?’ Of course, I want to meet my cast’s family too, but not on the first day and not in our first meeting,” Choi said. “[Then] Sang Heon was like, ‘Oh, actually, she’s playing Yuri.’ And then I was like, ‘What?!'”

According to Choi, the cast grew extremely close over the course of filming, so there weren’t too many more big surprises to follow. However, his sister’s presence did make things a little uncomfortable for Choi when he had to kiss Madison (Jocelyn Shelfo) while Kim was on set. “I didn’t want her to be there, and, oh my gosh, it was just so awkward . . . I [could] see Gia all the way there, behind the DJ booth set,” he told Netflix in May, “saying that his sister refused to leave even after he asked her to. “She was like, ‘No!’ And I was like, ‘What do you mean, no?!” he continued. “You want to see your brother kiss someone?’ I think that was my foremost awkward and embarrassing moment.”

Fortunately for fans — though possibly unfortunately for Choi — there may be even more moments like that in store, as the show was renewed for season two in June.

“XO, Kitty” season one is now streaming on Netflix.