Fans of hit Netflix revenge drama The Glory were in for a surprise when it was revealed on April Fools' Day that actors Lim Ji Yeon, 32, and Lee Do Hyun, 27, who star as on-screen enemies, are dating.

According to Korean tabloid Dispatch who broke the news, the couple met on the set of the drama and got close after a cast trip last summer.

They have been spotted on several dates over the past four months and their relationship was an open secret on set.

And it seems Song Hye Kyo, who plays Do Hyun’s love interest in the drama, could barely contain herself when she witnessed the couple's interaction at The Glory's press conference last December. 

Lee Do Hyun and Lim Ji Yeon have been spotted on several dates. Photo: Dispatch

After news of their relationship broke, netizens dug out videos of the press conference to observe the interactions between the couple but Hye Kyo stole the spotlight instead.

When the cast gathered on stage to take a group photo, Do Hyun signalled to Ji Yeon, who was standing on his right, to mover closer.

Seeing this, Hye Kyo, who was on his left, let out a smirk as she snuck glances at the two.

Song Hye Kyo (extreme right in both pics) trying to be discreet... ish

Netizens were tickled by Hye Kyo’s expression which seemed to suggest that “she knows a secret that you don’t”. 

“It's obvious that Song Hye Kyo’s last expression is trying to say, 'I knew things are not so simple between you two'," wrote a netizen, while another quipped: "She knows a piece of gossip that others don’t, and she can’t hold back anymore."

Netizens also pointed out that though Do Hyun and Hye Kyo played a couple in the drama, he was closer to Ji Yeon during the press conference.

Photos: Sinchew, Dispatch