Liu Hai wanted to conceal her feelings. Though she was the successor, she wanted to be a good dancer and perform on the stage. – Two-Sided Daughter
The New Year's Ball begun. She wore a dress decorated with pink bowknots and laces waiting for an invitation... – Waltz of Fate
The pair of dancing boots looks graceful. The lace tip is her favorite which helps her complete missions easily. – Lace Dancing Boots
The suit references Sofia's life, specifically referencing her double life as a successor to the Phantom Thief Family and a dancer. Her boots specifically help her complete missions while also acting as dancing boots.