Why does the Pepsi Logo resemble the Korean flag?

Although Pepsi Logo and Korean flag look similar now-a-day, but they are originated differently, and by tracing the chronology, we can see they are originated from different concept.

As we can see, Pepsi's original logo design include a wave-like pattern and adapts 3 colors (red, white and blue) with letters in the middle. And the symbol later on being simplified by taking out the letters. On the other hand, Korean flag is based on the simplified concept of taichi and bagua from ancient Chinese culture. And the white color is not an element in the flag center.