When it was confirmed that Hyeri and Ryu Jun Yeol were an item, fans weren't the only ones who were shocked. Their "Reply 1988" costars were just as surprised. 

"I had no idea that they were dating," Go Kyung Pyo said (per Soompi). "It was a shock to me as well, because it wasn't apparent. I think no one knew about it." He added: "I hope they're able to date without concerning themselves with other people's thoughts."

Hyeri and Ryu's romance didn't slow down their careers. He has gone on to star in television shows like "Lucky Romance" and "Lost" as well as films such as "The King" and "Little Forest" (per IMDb). 

And Hyeri has not only acted in shows "Two Cops" and "My Roommate Is a Gumiho" (per IMDb). She is also a member of the K-pop group Girl's Day. 

"Although we're busy, we're happily dating," she said (per Cosmopolitan). "I think I meet him as much as I meet the Girl's Day members." 

That doesn't mean the relationship doesn't have its ups and downs. When asked about how she feels about Ryu, Hyeri was honest. "It depends, but sometimes he's cold and sometimes he's warm," she said (per Soompi).