Captain Yu Sijin and Doctor Kang Mo-yeon met each other in Seoul, and there their love story ended in separation... Soon fate brought the lovers together again in Uruk, where they faced terrible events: the rescue of a baby poisoned by lead, an emergency operation of the League Secretary General Arab states, the day when Moyeon was on the verge of death, hanging on the edge of a cliff, an earthquake and a fateful choice: whose life to save... It seemed that all the most dangerous things were behind... And now Sijin and Moyeon, Taeyong and Myongzhu will have to fight an invisible enemy - deadly virus. One of the girls could have become infected with the type M virus when they performed the operation. Now the heroes will have to endure the strictest quarantine away from their loved ones. The life of doctors and military personnel will never be calm. The story of Sijin, Moyeon and their friends continues: many more difficult trials await them on the path to their happiness.