Actress Park Shin-hye endorsed a new track of K-pop girl group f(x) via social media Thursday to back her friend, Krystal.

(OSEN, SM Entertainment)

The 25-year-old actress posted the group’s new album cover on her Instagram account, with the caption: “Today begins with f(x)’s ‘4 Walls.’”

She also left a comment, saying, “I love you, Krystal,” flaunting her friendship with the singer.

Park, who is four years older than Krystal, first met her through her TV drama “The Heirs,” which aired in 2013, and the two have continued their friendship since.

The singers of f(x) are set to perform their new song “4 Walls” on Mnet’s music program “M Countdown” on Thursday, their first performance without former member Sulli.

Park has recently been confirmed to star in the upcoming movie “Older Brother,” which is set to hit theaters in 2016.

(khnews@heraldcorp.com)