@gumtaek Agreed with your assessment regarding Kim as a “stalker” when he accidentally took a picture of Cha through his camera. His facial reaction upon seeing her said it all. He was already curious about the red dress lady without knowing anything about her yet but a passing moment. Literally it seems like “like at the first sight” for Kim. So I believe he “followed” her to the sunset watching ledge. There the audiences get a quick glimpse of Kim via his white linen shirt with his camera hanging around his body. In fact, I think he was sitting probably about 20 feet away from Cha. That was a fortunate event that he was so close to her to rush towards her to catch her before she fell off the ledge. That was a first big save by Kim (there are two more big saves by Kim later in the drama).