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 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 revelation 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 and still talk or text daily, so there weren’t too many more surprises to follow.

“XO, Kitty” is now streaming on Netflix.