A possible summary is:
The video is about the K-pop group Seventeen visiting a six-year-old boy named Jaeyul and playing with him. Jaeyul is very energetic and makes the uncles do various activities such as jumping rope, back tumbling, origami, and tickling. He also teaches them how to make a dragon gun and a king viking with a blanket. The uncles try to keep up with Jaeyul's pace and humor, but they get tired and sweaty. At the end, Jaeyul's dad comes back with his two sisters, Ahyun and Ahrin, who join the fun. The uncles buy them ice cream to celebrate Children's Day.
Here are the key facts extracted from the text:
1. Seventeen visited Baby Cloud.
2. Jaeyul is 6 years old.
3. Junhui and Joshua from Seventeen came to see Jaeyul.
4. Jaeyul knows how to count in Chinese.
5. Jaeyul can say "hello" in Chinese.
6. Jaeyul is good at jumping ropes.
7. Jaeyul can do jumping ropes while sitting down.
8. Jaeyul knows how to make a paper car using origami.
9. Jaeyul is good at back tumbling.
10. Jaeyul is from a place called Yulhyeong-dong.
11. Jaeyul has a dad.
12. Ahyun and Ahrin are Jaeyul's sisters.
13. The family went to buy ice cream to resolve a fight between the sisters.
14. The visit from Seventeen was for a YouTube Original series called "Baby Cloud".
15. Seventeen's 10th album "FML" sold 4 million copies in 3 hours, setting a new record for K-pop albums.