Si Won has nice moments but also some problems

Si Won as Actor has some moments that stayed in my mind. Some emotions are too simple, and I cannot believe the character enough. 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. 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. I remember both the good parts and the parts that did not work so well.