City Hunter Episode 6

Na Na refuses to stay in her apartment after knowing that Yoon Sung bought it. Prosecutor Kim starts investigating the bus hijacker. Na Na packs her clothes and stays with her father at the hospital. When a crazed supporter rushes the crowd in agitation while Na Na is guarding Seo Yong Hak, she mistakes him for an attacker and slams him to the ground, causing Yong Hak to get angry at her. Yoon Sung and Na Na start living together. Yoon Sung follows Lee Kyung Wan and Hudson in a hotel and watches their conversation with a hidden camera. Soo Hee accidentally spilled alcohol on Yoon Sung, and they went to Yoon Sung's room to get his clothes dry cleaned. Na Na, accidentally knocks on Yoon Sung's door and sees Yoon Sung with Soo Hee. Prosecutor Kim also sees them, after following them. (Source: MyDramaList)