Amber Liu has paid tribute to her former f(x) bandmate on what would have been her 26th birthday.

K-pop star Sulli was found dead at her home in Sujeon-gu last year.

The singer, real name Choi Jin-ri, was in SM Entertainment girl band f(x) from 2009 until 2015 alongside Amber, Victoria, Luna and Krystal.

On her birthday Amber shared old pictures of them together along with the message: ‘Our Ssul, happy birthday. I’ll do my best.’

She added on her Instagram story: ‘My little sister, rest well.’

Some of the pictures Amber posted showed the two of them having fun together on a boat, staring out across the water and smiling at the camera wearing wetsuits.

With her Twitter photos the singer added the caption: ‘Let’s hang out again, my little sister. Happy birthday.’

A memorial was held for Sulli at Shinchin Severance Hospital following her death, where fans paid their respects.

Sulli had been open about her struggles with trolling, having left f(x) on hiatus in 2014 due to the malicious comments she was receiving online.

A year later, in August 2015, Sulli confirmed she was leaving the group for good.

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