He doesn’t actually get shot at the marble game, he goes away off screen. He’s actually the one that planned the game but he wanted to join because he is going to die and wanted to play his favourite games one last time
there's a reason they showed sae byeok's dead body vs showing jun ho's dead body. IDk if you ever seen other korean shows but they love doing this plot point where people are secretly alive, and they love giving them amnesia.
it's on my watch list, haven't watched it yet, but i asked my friends about their opinions on it and they said that it's pretty slow at the beginning so I'll have to power through the first eps