f(x) rapper Amber Liu showed that she can also deliver powerful ballad vocals through her moving cover of fellow SM artist BoA's song "Don't Know What To Say."

On September 5, Amber uploaded her cover of the song on her official YouTube channel What The Pineapple! which the idol shares with her friend Scott.

"For this week's video, we were feeling a bit musical and thus, decided to pay tribute by performing a cover song of 'Don't Know What To Say' by the one and only, BoA," wrote Amber.

"Technically, Amber decided to her own rendition of the song, and I just... watched. Hope ya'll enjoy!" added Scott.

BoA released "Don't Know What To Say" as part of her Hurricane Venus album in 2010.

After her cover, the ever-gracious Amber spent time thanking her friends who helped produce the cover video, namely the stylist, mixer and piano player. Amber's dog also made a cameo, playfully licking the idol while she spoke in the credits portion of the cover video.

Amber's cover is helping stir up interest as f(x) prepares to release a new album as a foursome.

The group has just celebrated their 6th anniversary since their first music show performance, with Amber thanking fans for supporting her throughout the years since she moved from America to pursue her idol dreams in South Korea.

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Mickey is a writer and digital content creator based in Manila. He is a co-founder of ZAVI App and editor of the small business blog IndieMickey. He has also been bitten by the K-pop fashion bug - follow him on Instagram @mickjami.