Is a Philippine passport holder allowed to leave Incheon Airport for sightseeing during a 12-hour stop-over?
You may be allowed to leave the transit area if one or more of the following apply:
- you hold a valid South Korean visa
- you hold a diplomatic passport
- you hold a physical visa from and are traveling to or from one of the following countries: Australia, Canada, New Zealand, United States.
- you are eligible to participate in the transit tour program
I got this from Wikipedia. If you believe any of the above may apply to you please double-check with the Korean embassy.