Chae Jung Ahn was aware of Yoon Ha.
On the 7th episode of KBS 2TV Monday/Tuesday drama "The Prime Minister and I" broadcast on December 30th, Kwon Yul (played by Lee Beom Soo) and Nam Da Jung (played by Yoon Ha) were drinking together in a blood sausage house as they were drinking
At this, Suh Hye Joo (played by Chae Jugn Ahn) who learned of this was upset saying, "Is it true that the two of you drank together?"
Kwon Yul said, "What's the matter" and she said, "It's not a problem if you're a real couple but you and Nam Da Jung aren't like that, right?"
Moreover, "You seem to regard her in a special way. I'm just curious of that reason" and showed a weird jealousy.