Nicole made her solo debut on Wednesday as she held a showcase for her first mini album.
The former member of Kara left the girl group early this year when her contract with DSP Media expired.
The title song "Mama" is about a girl who becomes a woman after falling in love. Nicole tried to change her cute and cuddly image to seem more mature and sexy.
"I don't intend to compete with Kara", Nicole said. "I just want to show my full potential. There were things I couldn't try when I was with Kara, so I decided to go solo to show what I can do".
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