Sung Jin Woo used shadow exchange before with the shadow guarding Jin ho when he saved Jin ho's father the chairman, and he forgot to put a new shadow on him, which is why is is unable to do it again and needs to search for him. Tl got it wrong.
Wasn't this guy super cautious about his own safety and well being in the beginning of this story? Why would he just reveal his biggest safety measure for no reason?
He acts like he is very powerful and he always has things under control, but his abilities are always described in such and undercutting way with a lot of limits. You get to learn more of what he can't do rather than what can do.
His body withstands the starry sky storm, but a bite can draw blood? I never understood why the author created this crap between them, and worse he continues to drag it out over hundreds of chapters and nothing changes.