Red-headed boxer girl = Moon Young
Moon Young does have that 'Cool Big Sis' vibe to her, especially with Jae Gu. Too bad it's just them, I want moar Wushu Bunny!!!
She's due for an appearance. She can handle herself pretty well so I'm not worried about her being jumped by Han Gyul and company.
But he's also going to do something incredibly stupid between now and the fight - count on it.