Guest Stars Ryu Abel as Han Yu Na Yoon Hyun Soo as Choi Yul Cho Jin Se as Song Woo Taek Song Young A as Cheon Song Yi Lee Seo El as Yoon Chae A Yoo Seung Mok as Vice Principal Kim Yi Kyung as Min Ji A Jung Young Joo as Shin Mi Sun Kim Hong Pyo as Han Pan Dong Kim Yi Kyung as Han Cho Young Kim Hae Jun as Shin Dong Cheol