Denise saw Ryu's interview at the television and she called Arya on her phone who then briefed her about the plan on how to make Shawn know the reality behind the whole thing.
Denise really admired that her Big Bro Ryu was genuinely concerned about Shawn and their relationship and wanted to clear things out regarding the misunderstandings between Shawn and the Kens.
She told Arya that she would also try her best to help but Arya insisted that she must not get involved and that she should focus more on staying at Shawn's side and must not meddle with issues regarding Kens and let big bro Ryu handle everything.
After a careful thought, Denise realized that she did not want Shawn to misunderstand her.
Arya was right, if she would open things to Shawn in favor of the Kens, Shawn might think that she was not truly in love with him but is gaining his trust to be able to help the Kens.