Appearance: I would say he's the classiest man, but probably less stylish in his default costume; that's when most younger males (and Lee) edge past him. But again, it's always good to see a character stick to it's roots, being a dedicated Taekwondo practitioner - he looks perfect. On his looks: tbh, didn't pay much attention to him during gameplay, but during story modes he looks real fine.
Moveset: Again, didn't pay much attention to him much (nor had used him against others), so I can't tell his moves apart from Hwoarang. Having said that, I find his combos and juggles pretty cool.
Story: I had started from Tekken 3, so can't comment much on Baek. But as I looked back the storyline (had to..), I found his story very appealing. Killing your loved ones by accident, can it get any more tragic? Life has been unfair to him in a strange way, and then BAM! Harada banishes him from the next two Tekkens! Poor Baek.
He, along with Hwoarang represents an epic tutor-pupil relationship. That's all..
Personality: A very real personality for his part of the story + what the person above me said
X-Factor: The fact that he has the rebel yeller Hwoarang behave like a wet cat in front of him. And, his juggles.
Final Score: 7.5/10