Wirelessly posted (iPhone 4: Mozilla/5.0 (iPad; U; CPU OS 3_2_2 like Mac OS X; en-us) AppleWebKit/531.21.10 (KHTML, like Gecko) Version/4.0.4 Mobile/7B500 Safari/531.21.10)
Because there's no market on such.... Japan and Korea are normally week long trip for typical HK-er separately, so it's hard to so both in 1 shot
One alternative is fly FUK and do the JR ferry to busan on to Seoul