Papa becomes a dog again after losing the dog statue he painstakingly obtained. When taking care of Cheonhajangsa Dolbogi becomes difficult due to Bonggu's absence, Hyanggi asks her younger brother Seolgi for help. Hyanggi announces she will live with Seolgi until Bonggu returns from his overseas business trip. However, Papa and Byeori, who know Seolgi's volatile personality well, are not entirely pleased with his presence, and Papa vows to turn back into a human as soon as possible. Meanwhile, a strange family moves into Byeori's apartment. They are Kangcheon, who appears friendly, his son Kangbaek, and Mansu, an elderly dog whose mind wanders. In fact, Mansu transformed into a dog after losing the dog statue, just like Bonggu. Faced with this, Kangcheon approaches Papa and Byeori with a plan to steal Bonggu's dog statue...