Writing

Financial freedom:

The cost of living in Hong Kong is about 2500USD per month, if financial freedom is achieved
Hold 7.8 million HKD in cash and invest 3% in government bonds
Make a product for $10 a month and sell it to 250 people
It seems like the latter is much easier, but it's not.

How to do this product that can make you financially free?
It's worth it if you can achieve financial freedom if the product use 3 to 10 years to made.
Reduce the cost of living, such as not living by yourself, eating simpler, and not buying luxury goods.
Diversified product types...