What is the ending of my koi fish girl?

Zhang You, who seems cruel, is actually very warm. Xiao Jin, a girl in koi fish, sparks love.

Koi fish Xiaojin, who can bring good luck to people, finally turned into a human figure, but unexpectedly, she was sent by the patriarch to human society to find Zhang You, an unscrupulous liar, and help him complete a major event in his life.