https://www.youtube.com/watch?v=MVThT8VyqwQ

this. 

tbh, I was hoping secretly that he'd sing to this song just once during his promotion in Korea but unfortunately he didn't.

But now my dream came true.

Even though the Korean version is more familiar to me (the word 'hanboman' keep stuck in my head, =P), I still love the Japanese version. ^^