He is saying "Nobody knows. It shouldn't be known." The caption at the bottom of the picture isn't directly translatable but is something like "Really neat" or "Its smart". I guess you must know the culture to understand it. The car appears to be a Diahtsu Charade. I rented one while I was working in Taiwan. The same model is in Japan, 3 cylinders, about 1100cc. A DeTomaso version of the car was available. All it had was an obnoxious paint job.
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