Hi;
I have been to Yongsan and see there's a LENOVO service center there, you can try to bring your laptop to Yongsan and have it repair in that service center, I do not know if the A/S will work for your laptop if it covers the wsrrasnty. if it really doesn't work, walk around the vicinity of the store the sells laptop, you can sell it to them or trade it with another laptop, you will just add more money because they will barter for your laptop at a cheaper price.
Don't forget the receipt of your laptop, and its better if there's a korean friend of yours that will assist you in describing your problems.
Good luck