Actor Yoo Seung-ho's acting is a bit unexpected

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Personally, I thought actor Yoo Seung-ho would grow into a truly great, character-driven actor,
but every time I watch his dramas, I feel like something is constantly missing.
He has the image of someone who would study hard, prepare thoroughly, and put in a lot of effort,
but I wonder if he's unexpectedly not putting in the work,
or if he's just lacking something innate.
I literally thought he would grow into a legendary actor,
so it's disappointing.