He qulificated himself for the Olympics 2016, but lost in the first match. With the team Lee has been the 4th place. In October he took part in the world cup, where Lee reached the Quarterfinals. Together with Yung Young-sik he won gold at the world tour grand finals and bronze at the WTTC 2017 in Düsseldorf. In the singles he reached the semifinals, where Lee lost to Fan Zhendong- so Lee won bronze. Of course that he became best South-Korean player. At the German Open he beat in the Quarterfinals Xu Xin and became the third place in the singles. At the Asian Cup 2018 Lee won bronze.