I feel Charles Roven is not convincing

For me, Charles Roven's work in The Killer (2024) is easy to talk about after watching. Some emotions are too simple, and I cannot believe the character enough. The role needs more detail, but the performance stays on the surface. Many moments pass very fast, and I do not remember much after them. For me, it does not feel very real in many scenes. I do not hate it, but it did not pull me into the story. Maybe other people will like it more, but this is my feeling.