For nearly three years, little Bryan Liu, now six, was on the waiting list for a new kidney.
He was born with one kidney, which became useless by the time he was two and the one his mother gave him in 2009 failed, too.
Then a stranger offered his, agreeing to endure both physical and psychiatric tests before undergoing the actual transplant operation.
While protocol does not allow the organ recipient and family to meet an altruistic donor, Bryan's benefactor had asked to see the boy.
The two met yesterday and Bryan got to personally thank the young man for giving him a new lease on life.