Iranian boys collected three golds, one silver, and double bronze medals to finish above South Korea and Uzbekistan.
This was a third men’s title for Iran, which is the only country other South Korea to lift the team trophy over 14 editions of the competition.
Meanwhile, four gold medals and a silver helped Iranian girls claim the title, with South Korea and Croatia in the following spots.
This was only a second women’s crown for the country.
Iran’s sensational campaign began with a couple of girls’ golds on the first day of the competitions, when Parnian Nouri defeated China’s Yinuo Xu in an intriguing -52kg final, while Aynaz Nasiri came out on top against Kazakhstan’s Nuray Kaznabek in the -59kg showdown.
Ghazal Houshmand bagged a third gold medal for Iranian girls on the penultimate day of the event, thanks to a straight-round triumph over Yang Xiruo of China in the -42kg final. Hana Zarrinkamar also finished on a high note, winning the -68kg final against the host’s Lim Yerim.
Saghar Moradi, meanwhile, made it to the final showpiece in the -63kg weight class, only to settle for a silver medal after a loss to Tunisian girl Masghouni Wafa.
In the men’s draw, Amirmohammad Ashrafi opened the gold account for Iran at the expense of Australian Aiden Stilley in the +78kg final.
Sina Mohtarami doubled Iranian boys’ gold count with a three-round win against Nurali Makhmut of Kazakhstan in a thrilling -55kg final, before Mahdi Razmian walked away with the ultimate prize in the -48kg class, courtesy of a victory over Spain’s Agenjo Trigos.
Elsewhere, Ali-Akbar Ebrahimi suffered a final defeat against South Korea’s Park Jae-won to take the silver in the -73kg contests.
Amin Ahmadvand (-78kg) and Amirmohammad Nasirahmadi (-51kg) finished their campaigns with a couple of bronze medals.
The juniors’ success came less than two months after Arian Salimi notched up a gold, with Mehran Barkhordari and Nahid Kiani collecting double silvers, while Mobina Ne’matzadeh won a bronze as Iranians made a clean sweep of four medals at the Paris Olympics.