The South Korean star defeated Iran's Mahla Momenzadeh 11-6 to add to her 2017 victory. 

It was the start of a string of golds for her country as compatriot Jang Jun reigned supreme in men's under-58kg final.

The Asian Games champion defeated Mexico's Brandon Plaza Hernandez 25-9 to to seal his first world title. 

Lee Da-bin, a two-time Asian Games champion, then secured gold at her debut tournament.

The 22-year-old thrashed Mexico's Maria Espinoza 22-2 in the women's under-73kg final.

The gold-medal bouts may have been all about South Korea but the evening's semi-finals were dominated by the host nation. 

Britain's Bianca Walkden, seeking her third consecutive world title, started the proceedings with a straightforward 19-9 victory over Mexico's Briseida Acosta in the over-73kg division.

Walkden will now face Olympic champion Zheng Shuyin in the final, which will take place tomorrow. 

The Chinese athlete had beaten Croatia's Doris Pole 9-2. 

Walken's compatriot Bradly Sinden then caused the upset of the tournament so far against three-time world champion Lee Dae-hoon. 

In what was an extremely tight contest, Sinden landed a last-second shot to win 24-23 against the South Korea in their men's under-68kg clash.

He will now face Spain's Javier Perez Polo in the final, who eased past Russia's Alexey Denisenko 12-6. 

South Korea will have the chance to claim another gold medalin the men's under-54kg final after Bae Jun-seo defeated Brazil's Paulo Melo 24-16.

Standing in his way will be Russia's Georgy Popov, who secured a 20-14 victory over Iran's Armin Hadipour Seighalani.

The action continues tomorrow.