Jong-un (born May 15, 2018 in Pyongyang, North Korea) is one of the adoptive sons of Marci and Matthew Cap, he is the youngest North Korean vigintuplet.
He has black hair covered by a Yin-Yang-colored parka.
He is a very shy teenager, and is very insecure, he is also clumsy, lonely, and troubled, he is nicknamed affectionately Yuyu (유유) by his North Korean siblings, Jong-un-kun (ジョンアンくん) by his Japanese siblings, Yu-kun (유군) by his siblings and parents, and Yu-chan (유 짱) by most of his siblings.
- Father: Matthew Cap
- Mother: Marci Cap
- Brothers: Han-yong Cap, Jong-nam Cap, Sang-Ook Cap, Jong-Chul Cap, Yong-rim Cap, Yong-il Cap, Pong-ju Cap, Min-ki Cap, Woo-sung Cap, Tae-won Cap, Sun-woo Cap, Young-Chul Cap
- Sisters: Hye-rim Cap, Hye-rang Cap, Young-Hee Cap, Min-Jung Cap, Ji min Cap, Young-mi Cap, Min-seo Cap
Team Terrific 10's Union of KoreansEdit
In Supernanny: The Theory AnimatedEdit
In the anime, he makes an appearance in the episode Yuyu when the Team Terrific 10 encounters him in an old barrel as a badly injured teen. Fortunately, the heroes comfort and heal him by taking him to the hospital and supplying him foods he likes.
- He is very good at horror games, and is called "The best Left 4 Dead player in this family"