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Joonsang and Yoojin finally make up with their friend. One day, Joonsang realizes that the last missing piece of his memories concerns his father. Meanwhile, when Professor Kim Jinwoo hears that Minhyeong is Joonsang, he cannot help but question whether Joonsang is his long-lost son.
Bae Yong-jun
Kang Joon-sang
Choi Ji-woo
Jeong Yoo-jin
Park Yong-ha
Kim Sang-hyeok
Park Sol-mi
Oh Chae-rin
Lee Hae-eun
Gong Jin-sook
Ryu Seung-su
Kwon Yong-gook
Song Ok-suk
Kang Mi-hee
Jeong Dong-hwan
Professor Kim Jin-woo
Kim Hae-sook
Yoo-jin's Mother
Jang Hang-seon
Supervisor Kim
Jung Won-joong
Teacher Park Jeong-o
Ha Jae-yeong
Jeong Hyeon-soo
Lee Hyo-choon
Sang-hyeok's Mother