[meeera]

Your English is better than my Korean, but it's not grammatical at all, there are incorrect words, and it's nowhere near professional standard. I worked hard to understand your pitch, and still don't fully get what you're trying to do.

In addition, you're asking people to sink really quite large amounts of money for a return that will be questionable at best. I have no idea what experience you have with electronic engineering, with business and marketing, why you're choosing this particular way of building a device, what arrangements you have made with manufacturers of eink screens, what market research you have done, what experience you have with quality control, etc etc. I have no idea when you actually plan to deliver the product, as two months is patently ridiculous. The market is likely to have changed pretty dramatically a couple of years down the track. I have no idea whether you have actually ever delivered a product to a market before. I don't know why you're choosing bluetooth as the ebook delivery method (it's a massive battery suck). I don't know what your plans are to support the device, should it ever exist.

Above in this thread, you've shown that you're not at all familiar with the industry as it stands, as you seem to be assuming that PDF is a preferred ebook format.