Daughter of the psychologist Berenice Nunes and André Fronckowiak, Mel Fronckowiak was born in Araranguá, in the state of Santa Catarina, but she grew up in Pelotas, Rio Grande do Sul, the hometown of her family. The actress was quite active in school and from early childhood had always dreamed of having an artistic career. She participated in the Grêmio estudantil and was several times representative of her class. In