Girl group f(x) Krystal made Girls' Generation Jessica cry with a special event.

On August 5, the last episode of OnStyle "Jessica & Krystal" aired.

Jessica and Krystal spent the night together at a hotel in Seoul. Krystal worried whether or not her special event would touch Jessica.

Jessica came in the hotel looking for her sister. Then Krystal told Jessica over the phone that she is behind the curtains.

When she pulled the curtains, there were stickers of Jessica and Krystal from their show. Jessica bursted in tears. There was a message, "I'm thankful that you are always on my side. I'm always on your side too. Thank you always. Let's stop crying."

The two met and bursted into tears together. Krystal said, "I like writing letters. I think I can write whatever I can't say."

Jessica said, "Saying my work is busy is just an excuse. You become parted with your closest people. You have to do better, that's why I feel so sorry toward you."

Then she said, "We don't have much time to spend together. Now we will have more time and more freedom. I want to do better for you and talk with you more."