Casella is a teacher and doctor in Milan. He has a large collection of books in his house. Professor Casella is a very kind man. He taught Romeo to read and write. The great professor brought the then 11-year old boy to the world of knowledge. In addition to these great deeds, he also took custody of Bianca Martini by the request of the dying Alfredo Martini. Dr. Casella treated Alfredo's younger sister as his real daughter. Every Saturday, the doctor goes to an orphanage and examines children.