
I don't remember him at all. Did he hate Lee Nok or something?
yes I think jaeshin didn't tell the old man that his son would be sacrificed for prolonging the old man's life. It was already too late and the son died, so the old man has basically been living in regret and wanted to hurt jaeshin back by doing this. It was hinted several times throughout the novel.
I get the feeling that both dragons will end up together and probably Nils would get his real crush afterwards