Kim had developed a good rapport with Sindhu, who time and again acknowledged the Korean's role in her success.
After a string of disappointing results, PV Sindhu parted ways with coach Park Tae Sang
The Olympic silver-medallist, who out-played Japan's Nozomi Okuhara 21-7, 21-7 in a lop-sided final in Basel, Switzerland on Sunday, was mobbed at the airport after she touched down, with national coach Pullela Gopichand by her side, late on Monday.
Kim Ji Hyun was handed the responsibility to sharpen the skills of former World No. 2 PV Sindhu with the World Championships and Olympics in mind.
Indonesian coach Agus Dwi Santoso has been roped in to guide the singles players -- both men and women -- ahead of Tokyo Olympics. Badminton Association of India (BAI) secretary, Ajay Singhania said the visa process has started and Santoso is likely to join the Indian team in the mid of next month.
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Reigning World champion P V Sindhu on Monday said she was completely blank after winning a second successive Olympic medal and it took her a while to realise the enormity of her historic achievement in the ongoing Games.
The Olympic silver-medallist, who out-played Japan's Nozomi Okuhara 21-7, 21-7 in a lop-sided final in Basel, Switzerland on Sunday, earlier addressed the frenzied media at the Indira Gandhi InternationalAirport in New Delhi on Monday
Defending champion Lakshya Sen looked in fine fettle as he registered a straight-game win over compatriot H S Prannoy to make a winning start to his title defence at the Yonex-Sunrise India Open Super 750 badminton tournament, in Delhi, on Tuesday.
'We actually have a big vacuum in terms of producing coaches of quality and it's not a training program. It's an ecosystem issue. So, we need to work harder to bridge that gap'
'It is the first time that India badminton player has won two Olympic medals in badminton, so it is a great achievement not only for Sindhu but also a big moment for my teaching life.'
Sindhu has said while there will be a lot of expectations on her going into the Tokyo Olympics
I don't want to respond to what her father has to say, if Sindhu says something, I will respond, Gopichand retorts to PV Sindhu's father's allegations of unsatisfactory training.
India's top shuttlers have missed his court-side presence this year but national badminton coach Pullela Gopichand says he can't really help cutting down on travelling as that would come in the way of finding the next crop of world-beaters.
India's badminton ace P V Sindhu said national coaches need to be more qualified in order to groom more players to become champions in the future.
'Her defence was the one only problem. (Carolina) Marin and Pornpawee (Chochuwong) are good attacking players, they were using a lot of half smash and straight smash, and when Sindhu's defence goes down on a day, it affects her other skills as well, she gets nervous. But now she has improved a lot in her defence as well. Her endurance on the court is also good.'
As the Indian national anthem reverberated across the St Jakobshalle stadium, Sindhu stood at the podium with moist eyes.
Sindhu seeks improvement on fitness, defence in se
India's chief national badminton coach Pullela Gopichand admitted to crammed BWF itinerary causing a problem but at the same time believes that onus is on a player of PV Sindhu's calibre to adapt to the calendar instead of complaining about it. Apart from the World Championships gold, Sindhu failed to win any other tournament last year.
India's badminton queen PV Sindhu revealed that working with new coach Kim Ji Hyun along with the guidance from Pullela Gopichand has been instrumental in taking her game to the next level.
V K Vismaya stunned her fancied opponents, M R Poovamma and Hima Das, to win the gold medal in the women's 400m race at the Indian Grand Prix-3, in Sangrur, on Saturday.