
Yes, you are right. I really hope he didn't do it. The way he grabbed Jinhyun's throat in ch. 41 really scared me, feeling his "friend's pulse" gave me psycho vibes.
Anyway, I liked how he changed his attitude at the beginning, so of course I'd like it to stay that way. Also I ship them... as friends :3

Maybe... and it's a good explanation. But, at first his hand was wrapped around the neck, like he was going to choke him. It was a weird scene in general, the way Jinhyun's vision was blurred for example (at first I thought he drugged him lol). Everything about Sangmin feels off to me. His intentions are unclear. Good on the author to put such a smokescreen, though, I enjoy it :P
Can't blame him for being unable to "show off", human lives are at stake after all. But of course, he can't escape the watchful eye of his sem.. err, "friend". Jokes aside, Sangmin scares me. He's capable of murder and you never know what he's thinking...