At school, he is more like a friend than a teacher, and a role model for his pupils.
At home, he is a responsible father of three young children, with the youngest just a year old.
Mr Mohammad Ghazi Mohamed, 35, is one of two Singaporeans still missing since an earthquake hit Sabah last Friday.
He is a physical education teacher at Tanjong Katong Primary School and one of the teachers who were accompanying a group of pupils up Mount Kinabalu when the earthquake struck.
Several current and former pupils took to social media to share their fond memories of Mr Ghazi.
Posting a group photo taken during a previous trip to Mount Kinabalu, one former pupil wrote on Instagram: "I remember I was one of the slowest in our group, but you always stayed behind me and asked if everyone was fine."
Another former pupil wrote about how he was not particularly good in hockey, but was still invited by Mr Ghazi to join the school hockey team in 2010 and given opportunities to improve.
He wrote: "You never gave up (on me). There were always chances given to me to reach higher...
"We meet every year, soon it's time for our annual meet again. Come back soon and let's revive all those memories."
Mr Ghazi, an avid football fan, is also well known as the teacher who would spend time after school every Friday to play football with pupils.
Georgia Jackson, 11, who was taught by Mr Ghazi last year, told The Straits Times: "He had a great sense of humour. He often made all of us laugh."
He is known for teaching his pupils important life values.
Former pupil Anam Devid wrote on Mr Ghazi's Facebook page: "He showed us clearly about teamwork, perseverance and respect... He did not make us respect him just because he is our teacher. He earned our respect."
Like his late father, Mr Ghazi is passionate about teaching and previously taught at ITE College East, reported Chinese evening paper Lianhe Wanbao.
His wife is a teacher at East View Secondary School.
His cousin told Lianhe Wanbao that Mr Ghazi's mother is prepared for the worst and simply hopes that Mr Ghazi will be found in one piece.
The cousin also said Mr Ghazi is a filial son, a thoughtful husband and a responsible father.
Meanwhile, the authorities have asked for blood samples from his mother, younger brother and younger sister.
The cousin believes the blood samples will be used for DNA testing to help identify Mr Ghazi.
Many pupils and staff are hopeful that he will return safely and many remember one of his quotes in the school's yearbook: "Leave no one behind. Never turn a blind eye."
One former pupil wrote on Instagram: "Where are you Mr G?... We're still hoping for your safe return. Leave no man behind and we're all waiting for you to come back safely.
"You will, right?"
This article was first published on June 9, 2015.
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