I feel Song Min-seok is not convincing

Song Min-seok as Stunts in Innocence (2020) made me pay attention more than I expected. For me, it does not feel very real in many scenes. 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. Many moments pass very fast, and I do not remember much after them. Maybe other people will like it more, but this is my feeling.