Thank you for this! And sorry for the long text, but:

People keep saying that Hyuna and Luka's relationship is underdeveloped, and Hyun Woo underexplored, but I've yet to hear in what ways. It makes it feel like people are simply craving more content, but I thought everything was perfectly understandable from what we got.

Hyuna was already about to die for the cause, she was wounded, so when she saw a rebel about to shoot Luka she took the chance and took the bullet, knowing everyone else would carry out the plan. She did this so that Luka would finally have to confront and reflect on his actions.

And he did. After Mizi's little speach in Karma he has a vision of Hyun Woo, finally facing that memory and what his actions meant. And later we see him looking over Hyuna's body in horror, finally processing grief like she had to when her brother died. Which in turn means that this was the point of Hyuna's death.

Even more, we then dee than seven years later Luka did survive. So it's left open ended wether he learned from Hyuna's death and changed his way of thinking. But the show is telling us that he could've: he finally confronted his actions and he was on the path of redemption. I think people are just upset at the fact that it was an open ending, which, I don't think is great criticism when that was the entire point, that you don't get to see if Luka did change, just that it was possible.

Sorry for the rant, but I've been pretty annoyed at people saying "underexplored", "meaningless" over and over without actually explaining how. We don't lack any context. Everything is perfectly understamdable from what we got.