Lee Kyu-han never quite convinces

Looking just at Lee Kyu-han's work as Actor, there is a clear point of view in the performance. It is not a careless performance, but it feels under-shaped. The performance is functional, but it does not leave much after the scene ends. The work never fully settles into the rhythm of the movie. I wanted more specificity, especially in the emotional transitions. Different viewers may value it more, but for me the effect was limited.