Blazevic was born in an ordinary family in Travnik, Bosnia and Herzegovina. His father opened a small restaurant as a source of life for the whole family. He is the youngest child in the family, with two brothers and two sisters. Because his mother was an elderly woman when she gave birth to him, he was very thin from an early age and didn't see any talent for sports. When he was five years old, his father invited a puppet artist to perform for them to celebrate the New Year. Puppets or people who perform puppet shows are called Ciro, which is Brazevich's nickname now. One of his brothers was beaten by his mother for giving him this nickname. Later, when outsiders knew this nickname, they all called him Lao Bu. His mother also begged everyone to leave the poor child alone and not insult him like this. In the mother's view, the puppet's life is doomed to be a tragedy and can only be manipulated by others. Even people who manipulate puppets are tragic, because they can only manipulate the body without the soul. But Blazevic didn't mind, so the nickname was handed down.

Although ridiculed, Lao Bu is full of firm belief in controlling his life. His two brothers, Anta and Joseph, were both killed in World War II. They are only 17 years old and 19 years old respectively. When their brother died, the old Bucai 12 years old. He became the only son in the family and the greatest expectation of his parents. He loved football since he was a child, but in this barren land of Travnik, in that war-torn era, football could not provide him with food and clothing. He has to do other work. At the age of 20, he went to a factory in Zagreb as an electrician and was almost electrocuted by a naked high-voltage line. If it hadn't been for the timely rescue of his master, he would have died. He still works there because Croatia has more teams and football atmosphere than Bosnia and Herzegovina. He loves playing football and shows his football talent by participating in various competitions after work.

The closest death occurred after he returned to Bosnia and Herzegovina. That year, because he suffered from severe brain trauma and colitis, his cousin, who was a doctor, had to ask his family to prepare for his funeral in advance. At that time, Lao Bu was also scared to cry, because once he left, the burden of his mother with severe pneumonia and his family's livelihood would fall on his father alone. Later, Lao Bu miraculously recovered. The family said that this was God's pity for a family that had lost two sons. Blazevic's coaching career began in Switzerland, where he had a short football experience, but he didn't make a splash. He started playing football as a professional coach at the age of 33, but during his career as a professional coach, the elites who received wide attention were concentrated in Yugoslavia. It was not until 1980 that the Croatian Yeka Club sent him an invitation to return to China that he had a chance to enter the mainstream football circle. When he led the team to win the 10 championship in the Great Yugoslavia League, he was quickly attracted by Dynamo Zagreb and invited him to coach.

After he led the team to win the league title of 1982, the whole Croatia was boiling. Croats have held the league trophy in the hands of Serbs for 24 years. They never had a chance to touch it, but Bruce helped them realize this dream. "At that time, I longed for success more than ever, because I passed death twice, and I didn't know when God would take me away, so I had to succeed as soon as possible before I left this world, so as to alleviate the great grief caused by my parents and sisters missing my two brothers for many years."