I hate myself so much right now but oh my god I saw spoilers many spoilers and I hate to say it but I think Keith got Character development..
Spoiler!!!
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So there was a scene where they were in a car and somehow they were about to crash I think and Keith hugged yeonwoo and jumped out of the car and kept yeonwoo safe and he had like a gun and Keith was shooting at someone or something and he was bleeding reallyyyy bad but he still was keeping Yeonwoo save in his arms and I started tearing up because that was so beautiful but than suddenly a tree was falling down towards Keith and yeonwoos eyes widen and he pushed keith away and the last scene I saw was Keith being shocked af and I think Yeonwoo got under the tree.....but I still hate Keith for what he did to Yeonwoo but I think Keith gets huge character development and I really liked Keith when he was so nice and kind to him he was protecting him so much I literally started crying...