Layover in Seoul (13 hrs) — Philippine passport + U.S. ROC (I-751 receipt). Can I do transit tour / visa-free entry?

Hi everyone,

I’m trying to figure out if I can leave the airport during a long layover in Seoul and I’d really appreciate any advice from people who have been in a similar situation.

I am:

🇵🇭 Philippine passport holder

🇺🇸 Living in the U.S. as a conditional permanent resident

My green card is currently expired, but I have a valid **I-751 Receipt Notice (ROC extension)**

My itinerary:

U.S. → South Korea (layover \~13 hours at Incheon) → Philippines

Return: Philippines → South Korea (layover) → U.S.

I want to know:

Can I qualify for **visa-free transit entry in South Korea** with my situation (expired physical green card + I-751 receipt)?

Am I allowed to join the **Incheon transit tour** or leave the airport for a few hours?

Has anyone with a similar immigration status successfully done this?

Or is it safer to stay inside the airport the whole time?