I am sure that older brother faked his little brother to protect him from someeone. He can't just tell the soldier guy. I am not sure what happened between soldier and older brother - maybe it changed after they listened about truth? And which means that when soldier glared at Baekwa (?) like he doesn't like him. I am sure that older brother cared about Yukio. Also still cares about soldier. So i am sure that Yukio is alive.
The orgimal in art was better before than now so i don't know why Author changed :( It was really cute before but now art is not bad , but it was better before. This is my opinion
I really hope that yhere no love triangle(?) Cuz i hate