just an update:
i am stuck here in korea. i was about to board delta airline and the lady saw my expired GC and started asking me immigration questions such as when i left the usa and why i stayed that long, why i was not able to renew my GC right away, do i have extension letter, etc. she said she called the CBP hotline in the CBP memo i showed and she was told not to board me. i told her that the korean airlines in the PHIL already called a CBP officer as well and was told it is ok to board me. she was told by the 2nd CBP that the 1st CBP was wrong in letting me board. so i called the number on that memo and spoke to a CBP. he told me that i should contact the US embassy about my situation. i told him about the CBP memo on their website and he said that that information was wrong. i told him it was on actual website, how come it was wrong. i asked if there is a supervisor i could talk to to verify the information he said. he told me he was the only CBP working. I asked for his name just for record purpose and he said they are not allowed to tell there name? he was so rude and unprofessional and just said bye and hang up.
the plane already left and i honestly dont know what to do. i am just confused as why the 1st CBP said i can board and the 2nd one says i cannot and that the memo on there website was wrong informatio? it does not make sense.