I do not know much about Kim Jong-nam, but he looks like the kind of guy that just wants to live life and have some fun. His half brother definitely isn't absolved from this with his infamous reputation for killing off family members.
Kim Jong-nam murder suspect says she was 'paid $90' for deadly 'prank' :
"Her health is stable. During the meeting with embassy officials, Doan Thi Huong said she was being taken advantage of and thought she was starring in a comedy video," Ref. Source 4s.