Round trip ticket Madrid-Finland-Beijing +Beijing-Seoul within 72h

Hi. I've got Round trip ticket from Madrid to Beijing, departing on the 18th of April and returning on the 12th of May. I'm planing to flight to Beijing on the 18th, stay there 72hs, then flight to Seoul(SK) within 72h with a different flight company and stay there around a week, apply there for a touris visa and flight to Shanghai for the rest of the trip, around 14 more days. Could I enjoy the 72 hours free stay for the first three days in this case?
Thanks
Mikel