Din was discharged from the hospital 3 days after P'Toll, Charm, Wam, and Nam came to visit. After the talk with his friends, Nan came back with his father. Din was happy to see Nan's father and so he is.
Din saved his plans for later and greeted Nan's father. This is the first time he met him after he had a comma, so Din feels both happy and awkward. He didn't know what to say and he only could say, "I'm happy to see you, Dad" with a weird tone.