I'm not sure why... but I can't enjoy her performance...

I don't even know why!! She's cute, but... it's just hard to watch her.

I actually like the actress, maybe you're not enjoyng her because she hasn't (yet) become important in the story
I love this drama but I kinda agree with Freya... Her acting doesn't feel natural to me, like I can tell she's acting rather than it looking natural. I don't know who the actress is and I don't have anything against her. It's my first time seeing her but I feel like she could improve perhaps with more experience?
I also like her, I feel like her appearance fit the char - about the acting, can't tell much as it is also first time for me to see her in drama - I feel like she is not very well-known actress yet.