Yamashita stars as a young doctor-in-training, working under the guidance of an experienced "flight doctor" (Toshiro Yanagiba). Some scenes will be filmed with a real helicopter, adding to the show's tension. Source
That's the main idea of the series and it attracted my attention. The two leading ladies boosted my interest too - a lot like 70%. I just have to adopt a wait and see attitude on other Japanese series as sometimes I have to see the show first so I could decide whether to watch it the rest of the way or not.