S1, E2: Min Jae takes expensive private math tutoring. He goes to Daegu to see if his mother visits his father. He runs into Seo Yeon on the train back to Seoul. An official ID card is issued to Gi Hyun, Min Jae's friend, as he turns 17. Min Jae's math tutor promises to award Min Jae if he gets' Grade 1 in the next exam.