Sol's heartened switch from an unhappy wife to a loving mother is one of the most delightful aspects of the show.
Sang Un's recent memory could be her getting ambushed, but very out of context.
One big difference between Dark Hole and Hwal is that Dark Hole succumbed to his monster instincts and decided to kill and drink human blood.
They chase him to the shore of a frozen river but hesitate to walk on the thin ice sheet.
I won't give any spoilers about the ending and stuff.
Dark Hole: Then it will be hard for you to get your soul back.