It's Beautiful Now - Season 1 Episode 24 Yu Na Confesses
Overview: Yu Na can't contain the guilt inside her anymore and tells Kyung Ae the truth. Kyung Ae becomes furious at her betrayal and tells her she doesn't want to see her anymore. Kyung Ae frantically gets a hold of Soo Jae, tells him what she knows, and screams at him to come home. However, Soo Jae doesn't and ignores her calls.