from high school. One day Jung-eun borrowed Hye-ryun's library card and used the university's library's facilities. She accidentally takes Kyung-min's seat and drools over his books while she slept, tired from studying. Kyung-min returns to his seat disgusted at her actions. Jung-eun apologises and leaves. Later, Kyung-min's friend accidentally takes his folder without informing Kyung-min. Kyung-min, believing that Jung-eun stole his folder, goes and chases Jung-eun down and demands she open her bag. Jung-eun defends herself by stating that she did not steal his folder. Their verbal disagreement turns in physical as Kyung-min grabs her bag and the contents are spilt out. Kyung-min realises his mistake and quickly gathers the things back in her bag. Jung-eun walks off in a huff. Soon, Jung-eun returns Hye-ryun's card and they have lunch in the cafeteria. As they chat, this was incidentally seen by Kyung-min. Kyung-min forms an idea. A few days later, he sees Jung-eun in the University park and decides to befriend her in order for Jung-eun to whisper favorable words to Hye-ryun. Kyung-min deceptively slips that he is Hye-ryun's friends. Knowing this, Jung-eun reasons that since he is Hye-ryun's friend, then he can't be too harmful. Due to Kyung-min's regretful attitude, Jung-eun decides to trust Kyung-min and they become friends. As they get to know each other, Jung-eun pours out her finance woes to Kyung-min due to her brother's theft and the resulting inability to pay the deposit for the attic house. Kyung-min, keen to be nice to Jung-eun, lends his money to Jung-eun. Cast Kim Rae-won as Lee Kyung-min Jeong Da-bin as Nam Jung-eun Choi Jung-yoon as Na Hye-ryun Lee Hyun-woo as Yoo Dong-joon Jang Yong as Nam Sang-sik, Jung-eun's father Kim Ja-ok as Kim Soon-deok, Jung-eun's mother Bong Tae-gyu as Nam Jung-woo, Jung-eun's younger brother Kim Mu-saeng as Lee Pil-deuk, Kyung-min's grandfather Kang Boo-ja as Lee Kyung-hee, Kyung-min's grandmother Kim Chang-sook as Hye-ryun's mother Cha Joo-ik as Kyung-min's aunt Kim Tae-hyun as Joon-ho, Kyung-min's college friend Seo Hyun Theatre adaptation It was adapted into a stage play of the same title in 2010, with Lee Sun-ho and Hwang Bo-ra in the leading roles. References External links Cats on the Roof at MBC Global Media 2003 South Korean television series debuts 2003 South Korean television series endings AZN Television original programming Korean-language television shows MBC TV television dramas South Korean romantic comedy television series Television shows based on South