I took some time to think about Kyungsoo’s acting, and here’s what really amazes me about his role;
Han Kangwoo is a character in the story, yes. He has a story line, a background, his own trauma that he suffers from. But as a character created by the schizophrenic Jang Jaeyeol, Kangwoo is a way for Jaeyeol to channel his PTSD after being stabbed by his brother. Therefore, Kangwoo is a character, but he is a character that embodies the subconscious of another character. So when Kyungsoo is acting as Han Kangwoo, he’s not acting out his own character, but the subconscious of another character.
tl;dr : Hang Kangwoo is a ridiculously complex character and Kyungsoo is 20x more fabulous for absolutely owning this role.