While the new MBC drama has been doing exceptionally well with high viewership ratings and positive reviews overall, some viewers seem unconvinced as to whether or not actress Han Hyo Joo really fits her character. Some have even called her the only "mistake" of the drama, criticizing her poor performance. 

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Comments stated, "Her over-the-top reactions make it impossible to focus", "Honestly, I've never thought she was a bad actress before, but you gotta admit her acting is awkward here... Especially when she's surprised, it looks like a sitcom. The story is so amazing, but Han Hyo Joo needs to do something about her acting", "She's not terrible, but she does overreact, and she just doesn't fit the character", etc. 

On the other hand, some netizens opposed these negative opinions, claiming Han Hyo Joo is doing perfectly fine.

What are your thoughts on the controversy surrounding Han Hyo Joo?