What is the song in Balala's Little Devil's Miracle Dance?

I don't know which song you are talking about. Both songs are very nice. In particular, the sentence "With the power of friendship, my magic becomes stronger, and only by overcoming gloom and sadness can we grow" in "The Little Magic Fairy of Balala" is super inspirational.

However, "Little Magic Fairy of Balala" and "Constellation Code" were both sung by AOA (full name of Ace Of Angels), a female group under FNC Entertainment of South Korea, with Henry Lai as the lyricist and Xu Shaorong as the composer.

Henry Lai, the lyricist, is a member of the famous Hong Kong Island Band, which was founded in 1985. Later, Henry Lai formed the Tiantang Band. He composed and made music for many singers. Henry Lai not only made great achievements in music, but also made outstanding achievements in film soundtrack. His film soundtrack "Seeing the Dragon in the Three Kingdoms" was nominated for the Best Original Film Music Award in the 28th Hong Kong Film Awards and the Best Original Film Music Award in the 3rd Asian Film Awards. His original music album "The Thief of the Years" won the Crystal Bear Award at the Berlin Film Festival.