Kim Hyun-kyung did not work for me

I watched The Box (2021) and Kim Hyun-kyung was one of the parts I kept noticing. Some emotions are too simple, and I cannot believe the character enough. The role needs more detail, but the performance stays on the surface. I do not hate it, but it did not pull me into the story. For me, it does not feel very real in many scenes. This is only my personal view, but the performance changed how I enjoyed the film.