On January 31, Jessica posted commemorative photos of Krystal and herself at f(x)'s first solo concert via personal Weibo account. In the photos, you can clearly feel the love and affection that the Jung sisters have for one another. 

SEE ALSO: Legal reps exchange accusatory remarks at civil court hearing in HYBE vs. Min Hee Jin lawsuit

Meanwhile, f(x)'s held their first ever solo concert this past January 29 to 31 at Olympic Hall, Seoul, after almost seven years since debut.