ML Master Fu's Reasons

Semi-spoilers for the Origin episodes.

I wondered why of all Parisians in Paris, Master Fu choose Marinette  and Adrien   to be the next heroes. I mean, yes, they showed kindness to an old man, but why did he choose to pretend he needed help at those moments? Was he randomly putting himself in danger, and using ninja skills to get himself out of it when nobody helped him, until he met our main duo? (Drat, should've done a comic about that!)

It's the food that decided it. FOOD IS EVERYTHING!  
... I shouldn't write descriptions hungry.