Krystal and Jessica's sisterly bond is very heartwarming and it touches fans' hearts.

Recently, a news reported that Jessica cried at her birthday party pre-celebration on 11th upon reading a touching letter from Krystal. A fanaccount of a fan who attended Jessica's birthday party posted some photos of Krystal's surprise appearance and their sweet and emotional meeting.

According to the fanaccount, as Jessica finished reading the letter aloud, Krystal appeared and surprised her sister. Jessica was crying throughout the time she's reading Krystal's letter. Krystal hugged Jessica and both cried emotionally.

Such a sisterly bond everyone of us wants to have.

Photo credit: as tagged