In the afternoon, I was with my calculator showing my dad the theoretical revenue model.

I have no knowledge to build a detailed one but I have a simple and promising model.
It's meant for everybody to understand.

He looked at the math and was convinced by me in an instance.

"It is the best one among all your previous business ideas." He said.

So I looked into his eyes and asked:
"Dad, would you look down at me if I fail this?"