45cat - Krystal Generation - Hard Knot To Swallow / I'm Gonna Build - T-Box - USA - 102
Girls' Generation's Jessica vs. f(x)'s Krystal: Guess Who Won the Battle against the Flashes? | Soompi
SNSD's Jessica and F(x)'s Krystal Jung aren't the only famous Korean siblings – think NCT's Doyoung and Gong Myung, Twice's Jeongyeon and Gong Seung-yeon and K-pop duo AKMU | South China Morning
Krystal Jung - Age, Bio, Birthday, Family, Net Worth | National Today