The Wikipedia article on Puyi is very complete, good for a start, you can also read his own book "From Emperor to Citizen" which details his life written by "himself" (Ghost writer actually, but yeah). Of course, one must understand that he might be trying to clean up his reputation in his book, but nevertheless it is a good read, especially when he details the fall of Manchukuo when the Soviets invaded in August 1945, how literally everyone panicked and deserted.
The Wikipedia article on Puyi is very complete, good for a start, you can also read his own book "From Emperor to Citizen" which details his life written by "himself" (Ghost writer actually, but yeah). Of course, one must understand that he might be trying to clean up his reputation in his book, but nevertheless it is a good read, especially when he details the fall of Manchukuo when the Soviets invaded in August 1945, how literally everyone panicked and deserted.