It's already the 100th anniversary of the rainbow gathering. How about a day the parents? Kangnam's mother came to his single house in Gangnam from Japan! The mother is pleased to see her son's hot popularity. She goes from nagging to playful with Kangnam. How will this special Tom & Jerry like date go with his mom? Meanwhile, Taegon, the man with flowers, appeared in front of his mother in Gangnam! It's Joongwan's mothers first time visiting the rooftop home. A home-cooked meal is prepared for her son. Jungwan invited Kwanggyu, a Busan man, to get drunk on the taste of his hometown. A family like photo is taken and it's a day full of filial piety!