Single - entry Tourist L to China

My friend and I would like to travel to Beijing in February for around 4 days. We are currently employed in South Korea. As far as I am aware the valid time of Korean visa has to be 6 months or more, but one of our friends who was also employed here was told differently. I would like to know if there is any possibility of us getting one? We are both British citizens and in February I will have 5 months left on my visa and she will have 2 months.