S1, E3: Jae In's mom puts Cha Don in an orphanage, but he manages to come back to the house by memorizing all the signboards he saw on the way to the orphanage. Shortly after his return, Se Kwang and the police barge into the house, looking for a ledger that has information that can prove Cho Sang Deuk's corruption. The ledger is thrown out the window, and Cha Don burns it in a barbecue fire. However, to everyone's surprise, he remembers every essential information from the ledger.