On the February 28 airing of KBS 2TV's 'Happy Together 4,' actress Park Yoo Na talked about 'SKY Castle' co-stars Kim Bo Ra and Jo Byung Gyu's dating news. 

The MCs asked if she knew about their relationship. Park Yoo Na answered, "I didn't know because I'm slow with this kind of things." When asked if she still didn't notice during the cast and crew reward vacation, Park Yoo Na said, "The two just kept disappearing on their own."

Park Yoo Na also shared the 'SKY Castle' actors Kim Hye Yoon, Kim Bo Ra, Jo Byung Gyu, Kim Dong Hee, and SF9's Chani are very close and have a group chat. 

She shared, "Dong Hee is the most talkative. He uploads many photos of himself," and added, "Kim Bo Ra and Jo Byung Gyu have been silent (since their dating news)."