His new-found toughness was illustrated when he injured his foot during a training run but insisted on finishing the course.

"Five-kilometer runs require both endurance and willpower. Every time I feel I have used all my energy at the end of the run, I motivate myself by thinking of my parents and my newborn brother. I work hard for them," he said.

"In June, my 1-year-old sibling called me 'brother' for the first time. I felt so happy and knew I must set a good example for him. My father has supported the whole family, but now I must shoulder some of his burden."

When he leaves the PAP, Long plans to run a business renting basketball courts to adults and also provide a facility where children can learn about the sport. He wants to run a grocery store, too.

"I never envy my friends from high school who are now running businesses," he said.

"While I am still serving in the force, I will do my best. I know I can learn a lot here," he said.