Not speaking Mandarin held him back from many of his goals in life. When he tried to learn with Chinese school or apps, nothing ever worked and he failed every single time.
He then tried out the Copy & Paste™ method and learn to speak Mandarin in 6 weeks.
The key is to leverage your already existing Cantonese background with the Copy and Paste Method™.
With that, you will be able to speak Mandarin in 6 weeks.