Two years ago he became ill with end-stage liver disease, with no obvious causes.
Mr Hanna is no stranger to people with health problems, working as a pharmacist.
He began seeing a physician because he had been unnaturally tired, had lost a lot of weight and had continual night sweats.
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READ NOWMr Hanna said he never thought he would need a transplant and after four weeks in hospital was discharged because doctors said there was not much more they could do, other than schedule monthly check-ups.
He said that he had to wait for the magical phone call.
“As time went on, my condition showed no improvement, with excessive lethargy, great loss of appetite, my eyes were yellow and I was unfit to work,” he said.
Mr Hanna said in January this year his home phone rang with doctors calling to tell him they had a liver and for him to be ready as soon as possible.
He went through pre-operation preparations and about 15 tubes of blood were taken from him.
He was told there were no promises, but to try to get some sleep before a final assessment the next morning.
Now the 29-year-old is back in full-time work and feeling the best he ever has.