I think the fact that he opened his eyes a little at the last panel means that all this chapter was an act. I mean… It's Sangwoo so we can't know for sure but my opinion is that he wanted to have Bum's total trust and devotion once again so he acted all nice and considerate but inside he's still the same. This story is so twisted :o I'm sure that even the movie that Bum was watching means something in the plot!
But it's still pure genius *_* *_*
This comment section is so cool. It warms up my heart :D <3 (I don't even know if this is English x) )
Anyway OH. MY. FREACKING. GOD :o :o :o I am so happy!!! Right now I don't even want to think about the next chapters, I am just so happy for this one.