For our overseas friends who may not understand this video:
It is a story of Glenn who was a troublemaker in his school. He didn't care about his studies and even his parents seemingly care more for his younger sibling. Note that this is an olden Asian parents mentality where they provide more care and attention towards the child they feel have a brighter future. He grew even more rebellious and was even sent to a Boys home which is like a residential 'prison' for juvenile offenders. Mr Kumar is a teacher who noticed his potential as a public speaker, and his diligence in motivating Glenn made him turn over a new leaf while Glen was serving his time in the Boys' Home. Come present day, Glenn appreciates what Mr Kumar has done for him and is now a motivational speaker (perhaps to troubled youths, just like he once was).
This is based on a true story. The purpose of this commercial is to inspire Singaporeans to take up the teaching profession and impart on them the value a teacher has in making a difference to the lives of their students.