W: Two Worlds Apart S01 E04 What Is This World Where You Live In?

"The Life Between Books And Humans."

Kang Chul tells Hyun Seok that Yeon Joo is the only one who can reveal the secrets of his life. Meanwhile,Yeon Joo gets arrested because of So Hee. Kang Chul visits Yeon Joo in prison and tells her to answer his question in order to go back.