Kim, a former South Korea international and coach, sat by the courtside as Sindhu thrashed 2017 champion Okuhara 21-7, 21-7 in one of the most lop-sided finals in the history of the tournament.
Former track and field star PT Usha shared a photograph of a young Sindhu with a message where the shuttler can be seen sitting on her lap.
PV Sindhu arrived in India on Monday night following her World Championship triumph in Switzerland and was greeted by the fans at the airport.
It was her fifth medal at the World Championships, which is the joint highest in women's singles in the history of the tournament along with Xhang Ning of China.
PV Sindhu dominated Japan's Nozomi Okuhara and won the match 21-7, 21-7 in just 36 minutes in a one-sided final in Basel.
Two-time silver medallist PV Sindhu became the first Indian to win the World Championships gold by thrashing familiar rival Nozomi Okuhara.
PV Sindhu's mother said her daughter always gave her birthday gifts. "This time she has given a great gift to me and to the nation," said Vijaya, a former national level volleyball player.
As the Indian national anthem reverberated across the St Jakobshalle stadium here, Sindhu stood at the podium with moist eyes.
Olympic silver medallist Sindhu beat Japan's Nozomi Okuhara 21-7 21-7 in a one-sided summit clash in Basel, Switzerland, to clinch her and India's maiden gold in the World Championships.
Sindhu defeated Japan's Nozomi Okuhara in straight games 21-7, 21-7 to lift the women's singles title in Basel, Switzerland.
Andhra Pradesh CM wished that the Hyderabad girl's winning streak continues.
"This means a lot, it is a big win. I had lost in the finals in the last two editions," said Sindhu in an on-court interview after the match.
It was Sindhu's fifth World Championships medal -- joint-most for a woman singles player with former Olympics and world champion Zhang Ning of China -- to go with the two successive silvers and a couple of bronze medals.
PV Sindhu dominated the show and beat Okuhara 21-7, 21-7 to clinch maiden gold in BWF World Championships final.
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