The whole affair has not only the ethical aspects discussed here:
But it turned out the whole matter was a big scam. Quotes from the Spiegel article:
"Hwang has been in his home country in the center of a personal cult that is difficult to comprehend for Europeans. 'Now it turns out that they pinned their hopes on a swindler,' Schöler said in a talk with Spiegel Online."
"Some experts explain his behavior with the South Korean culture of trying to get maxium success in minimum time."