Park Shin-hye and Krystal are friends.
Krystal posted a picture of a coffee truck on her Instagram.
It was sent by her friend, Park Shin-hye. She wanted to present ice cold coffee in the blistering heat of the summer.
The coffee truck had a message for Krystal as well.
The two met in the SBS drama "The Heirs".
Meanwhile, "Bride of the Water God 2017" stars Krystal, Nam Joo-hyuk, Shin Se-kyung, Lim Ju-hwan, Gong Myung and more.