Jel's manga / #murderer(4)

I’m a bit confused about the ending more so that I want to know what the characters were thinking what were Clark’s feelings throughout the manhwa when did he decide to kill Alex. What did Alex feel when he died, agony? Regret? Loneliness? Despair? I don’t know. I feel like the inspector could’ve been used more but that’s just a passing thought. It’s I don’t know how to say. It’s not that I’m sad or angry at the ending but I’m also not happy or relieved. I think I feel a sense of apathy to it. Not good neither bad.