Jang played in the mixed doubles tournament at the 2018 Winter Olympics with Lee. She was youngest curler in the tournament. On February 8, she played the Finnish team in the first game of the preliminary round and defeated them 9–4, with Finland conceding after 7 ends. In the second game, they played the Chinese team and after being down 6-1 after four ends, rallied to tie the game, only to lose in an extra end. On February 9, in their third game, they lost 3–8 to Norway, but they beat the US 9–1 in their fourth game. On February 10, in their fifth game, they lost to the Olympic Athletes from Russia, and lost their sixth match against Switzerland. In their seventh and final game, they 7–3 to Canada. They would finish the event in fifth place.