famous, infamous

Famous or famous means widely known, renowned, or celebrated--
"Let us now praise famous men..."
He wanted to be a famous actor, so he moved to Hollywood.

Infamous or infamous ( one word ) means widely known for crime or bad behavior; having a bad reputation; disreputable; notorious--
The public hoped that the police would catch the person who had committed the infamous crime.
The murder is still infamous, even though it happened thirty years ago.

Now that you know that, you can say--
"He dreamed of being rich and famous, but he became an infamous con artist instead."

Note--"in famous" (  two words ), might make a part of a sentence, meaning on the inside of, or within ( in ) well-known or celebrated ( famous )--
He likes to write down quotations that he reads in famous books.
You can look for the symbolism in famous works of art.