Park Bo Gum struggled with his 'Moonlight Drawn by Clouds' character in the beginning?

To Yonhap News, Kim PD said, "I was worried about Park Bo Gum's capability to adapt to the prince character. All we could do was practice, so he practiced multiple times. He also struggled a lot at first. He didn't know how to set the tone for the character and couldn't do well because he was intimidated by actor Cheon Ho Jin (or character Kim Hun)."

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However, Kim PD said Park Bo Gum drastically improved, and explained, "But then one moment he just got the hang of it. I think it was about 2 months into filming and then he became the perfect Lee Young." 

He then revealed, "After seeing Bo Gum perfecting his character, I came to rethink the previous filmings. So we actually re-filmed the first 2 episodes. Luckily, we had time to re-film due to the Olympics, and thanks to that, Bo Gum was portrayed well from the first episode."

As we become more and more amazed by Park Bo Gum's outstanding performance on 'Moonlight Drawn by Clouds', isn't it hard to believe that he struggled in the beginnig?