Moon Hee Jun dropped an obvious hint about his engagement. 

'Radio Star' aired on December 7 with Moon Hee Jun, Tony An, Irene, Seo Yuri, and Seo Ji Hye as guests. 

SEE ALSO: H.O.T's Moon Hee Jun and Crayon Pop's Soyul announce their engagement!

During the show, Seo Ji Hye said, "I used to be a fan of H.O.T. I was a Tony An fan, so I've always wanted to meet him in real life." Seo Yuri also revealed that she was a fan, saying, "I used to call myself Kangta's wife." Seo Ji Hye added, "I was called Tony's wife." Then Kyuhyun made fun of Moon Hee Jun saying, "Where is your wife?" Moon Hee Jun replied, "I will be meeting my wife soon..." with emphasis. 

The very next day after the recording of this 'Radio Star' episode took place, the singer announced his engagement to Crayon Pop's Soyul! Fans are amused while watching the December 7 episode of the show since during the show, the panelists had no clue about the engagement!