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To be honest, I've totally lost track of NPB recently. It's not nearly as entertaining as it used to be and it's some how even slower too.
Off hand, the only comment I have is that this dude is tiny. He's 5'10 on his listing, which is a good half a foot shorter than Sasaki. So that's about Shiggy Hasegawa sized, who's probably the most successful short Japanese reliever.
I've hunted down some other vids...
https://www.youtube.com/watch?v=kzzkW-eLb7g
The commentators report his arsenal is 90% fastballs, 8% sliders and 2% changeups/splitters.
You'll see Double Play Twin Jose Lopez hit a single off of him.
This search will get you another giant pile too...
https://www.youtube.com/results?search_query=오승환