One half of the Singaporean musical duo By2. Along with her twin sister, Yumi, the girls gained fame in 2010 with their popular third studio album Grown Up. Since their debut, the girls have released over half a dozen successful albums.
From an early age, she and her sister trained in violin, piano, ballet, and numerous other dance styles.
In 2012, By2 represented Singapore in the reality talent show Asian Wave.
She is the elder of the Bai twins. Her father died of cancer when she and Yumi were fifteen.
In June 2017, she posted an Instagram photo with Taiwanese pop star Calvin Chen.