Seungjae prepares a surprise for Jiyong's birthday with his mom. Sam prepares a special event for William's birthday. Seoeon and Seojun spend the day with CNBLUE's Jung Yonghwa at their house.

Taeyoung and Rohui prepare an event for the couple's 6th anniversary and take a summer trip to a river with Eugene. Gyojin's family welcomes visitors while Gyojin gets to have pregnancy experience to understand Ehyun better. Jiyong and Seungjae's zone-out stay takes an unexpected turn. And Seojun and Seoeon learn about sportsmanship by competing with each other at the sports class.

Hwijae takes Seoeon and Seojun to World Insect Fair as well as Folk Village to have a good time. Donggook's children spend a day with star uncles[18] while Donggook is out for work. William's grandmother comes to visit Sam's family from Australia, and goes on a Seoul tour with them. Seungjae learns how to be a big brother by playing with his little cousin.

Jiyong and Seungjae visit Jiyong's elementary school together. Sam and William spend a special day with William's grandmother who is visiting for William's first birthday. Hwijae takes the twins to a special library. Seola, Sua, and Sian spend the day with Wanna One members.

Jiyong and Seungjae go on an impromptu trip together with strangers to Yangyang County. They spend a fun time with the other travelers. A special guest visits Sam and William's home. Hollywood star Steven Yeun visits to spend the day with William. Donggook, Seola, Sua, and Sian spend the day taking care of their neighbor's dog.

Jaesi, Jaea, Sua, Seola, and Sian prepare a special day for their dad who is leaving for the national soccer team training. Hwijae takes the twins to a blood donating center. While their dad is busy donating blood, Seojun and Seoeon spend a fun time together. Singer Kim Jongmin visits Seungjae's house to spend the day as Seungjae's uncle.

Sam and Willam visit a character festival together. At the festival, they meet famous actors who are also visiting the festival. For the "Uncle Special", Seoeon and Seojun spend the day with Junjin and Kangnam. Seola, Sua, and Sian spend time on a deserted island with their dad.

Seola, Sua, Sian, and Donggook go on an adventure on a raft. They enjoy the last bit of summer in the water together as they play games and eat delicious watermelon. Meanwhile, Hwijae comes up with a special plan to stop Seojun and Seoeon from fighting. He separates them and tries to teach them the importance of brotherhood.

Donggook and Sian spend the day delivering steamed rice cakes to their new neighbors. Sam and William visit a cafe made for kids with their friends. While Sam spends time with his foreigner friends that he met in Korea, William has fun with their kids.

Ki Taeyoung and Rohui visit the hair salon to change up Rohui's hairstyle. He tries his best to learn how to do different hairstyles for Rohui. Seoeon and Seojun spend time delivering rice cakes to people they are thankful for, and Victor and Jane spend time together at the ice rink.

To celebrate Seungjae's birthday, Jiyong prepares presents for Seungjae and plans a unique event for his wife who is also celebrating four years of being a mother. Victor and Jane visit the Red Square in Moscow to spend a special time together. Sam and William spend a fun day with the child actor Lee Rowoon.

To celebrate The Return of Superman's fourth anniversary, a special bazaar is planned. The families spend a meaningful time as they prepare for it. Also for this episode, Choo Sunghoon and Choo Sarang's family makes a special appearance.

To celebrate the show's fourth anniversary, all the families gather and spend a fun time playing together. Super Market finally opens, and the families take time to get to know each other even more.

Sian goes for training with Donggook for his very first kick-off event while the sisters cheer for him enthusiastically. At the temple stay, Jiyong is surprised once again how well Seungjae adapts to the new environment. Meanwhile, Sam prepares something special for the baby-to-be-born.