It was revealed that Nicole quietly left for the U.S on January 25th, she is planning to stay there for 2 months and receive intense training on vocal and choreography.
To prepare for future solo activities, while she staying in the U.S, she will receive choreography training through famous choreographers who have worked with Beyoncé and Jennifer Lopez before, for 4 hours a day. There's still no plan about her vocal training.
Before leaving she left a message for fans on her twitter,"I will work hard and come back! everyone please be healthy^^ thank you for your support~"
We will wait for your return Nicole!