After reading commentary for ep 14, it seems that Unnyun is taking this "Young Master is alive!" business in her stride! I expected shock and more shock, and of course happiness that he's alive, but also an overwhelming sense of loss of what could have been, and guilt over what had happened (which I hadn't seen a lot of, frankly). I haven't seen the episode, but have read that Lee Dahae did well in that scene - I gotta reserve judgment on that one. Like you said, a taste of her own medicine, since he was with Seolhwa, and if she weren't regretting this at all, then she's bloody saintly and unreal (and badly written).
As for getting Daegil back in the plot, well ep 14 showed the way, I guess, but in a sad manner - I'm still hoping against hope that General Choi and Wangson survive, there'd be no more fun and laughter if they're gone
I think Daegil will go after Taeha thanks to Chulwoong's machinations, get caught up in the political intrigue, and maybe die a horrible death or something... And Chulwoong... needs an a$$-whupping! So mad at him
I think we'll probably end up with the leading trio (DG, UN, TH), slave-hunting gang and villains all dead, maybe just about everyone except Eopbok and his chick. That might be a first, eh?