how to take itx to nami island?
['Step 1: Buy the ITX Tickets Online. ... ', 'Step 2: Take the Metro to Yongsan Station. ... ', 'Step 3: From Yongsan Station, Take the ITX Train to Gapyeong Station (60 minutes) ... ', 'Step 4: From Gapyeong Station, go to Nami Island Stop (5 min).']