In 2014, he and Lee Yong-dae have been handed one year suspensions for missing doping tests under the BWF Anti-Doping Regulations. He and Lee were required to provide whereabouts information for the BWF to conduct out-of-competition testing. In 2013, both athletes accumulated three whereabouts failures in connection with this administrative process.[14] The Korea Badminton Association imposed $41,170 penalty for administrative failures. The panels that manage the doping tests reconsidered the case and decided to lift the punishment. The information and evidence presented at the January hearing was insufficient and ambiguous and there was no proof beyond reasonable doubt that the players were not at fault. In April 2014, after reviewing its original decision, the BWF panel wiped out the players missed tests and filing failures and expunged their records.[15][16]
In 2015, he and Kim Sa-rang won the Korea Masters Grand Prix Gold tournament in the men's doubles event. In the final round they beat Ko Sung-hyun and Shin Baek-cheol with the score 16–21, 21–18, 21–19.[17] They also won the China Open Super Series Premier tournament, after beat Chai Biao and Hong Wei in the straight games.[18] In 2016, they also won the Superseries Premier tournament in Malaysia. He and Kim Sa-rang beat the third seeded from China in the quarterfinal round, and the world No.1 pair, Lee Yong-dae and Yoo Yeon-seong in the semifinal. In the final round they beat Chai Biao and Hong Wei with the score 21–19, 21–15.[19] He and Kim Sa-rang competed at the Summer Olympics in the men's doubles event. They lost in the quarterfinal round, defeated by Fu Haifeng and Zhang Nan of China with the score 21–11, 18-21 and 22–24.[20]
The BWF World Tour, which was announced on 19 March 2017 and implemented in 2018,[21] is a series of elite badminton tournaments sanctioned by the Badminton World Federation (BWF). The BWF World Tour is divided into levels of World Tour Finals, Super 1000, Super 750, Super 500, Super 300, and the BWF Tour Super 100.[22]
The BWF Superseries, which was launched on 14 December 2006 and implemented in 2007,[23] was a series of elite badminton tournaments, sanctioned by the Badminton World Federation (BWF). BWF Superseries levels were Superseries and Superseries Premier. A season of Superseries consisted of twelve tournaments around the world that had been introduced since 2011.[24] Successful players were invited to the Superseries Finals, which were held at the end of each year.
^Sukumar, Dev (10 January 2018). "Action-Packed Season Ahead!". Badminton World Federation. Archived from the original on 13 January 2018. Retrieved 15 January 2018.
