FRA-SHA 2 days stop (with 3 months visa) SHA-CJE-SHA (3 days overlay) SHA-FRA

Hi,

I have a visitor coming from Germany. He will be entering the city with his 1- entry visa. Then we will spend 2 days in SHA after which we plan on flying out to South Korea (Jeju) for 3 days). After those 3 days, we want to fly back to SHA where he will spend <3 days with me before flying back to Germany.

My question is: will he be eligible for the 72-h-visum upon our return from South Korea to SH
Thanks so much in advance for your answer!