The pairing isn't that horrifying. Kind of cute actually. In fact, I hear they hint in a War and XPs bonus comic that it's actually canon. That pun on the other hand...ouch.
Despite what the spoiler in my sig would have you believe, I actually like Sangwaan/Hinjo somewhat. Sangwaan is a scholar who needs a warrior like Hinjo to protect her while Miko is a warrior who needs a scholar like Sangwaan to guide and instruct her.