There wasn't really a plot... The drama was character-oriented. Which is not a bad thing, but make any story less…
Actually, you don't know where to put it in particular... romance, action, comedy drama???.... Cause there's really and seriously NO STORY AT ALL!!... Non-sense!!.. yes you are right, the writer might be dictated (by whoever), to create an ending like that... Otherwise, threats would be coming her way... hahahah... But I admire those writers who takes the risks, as long as there is a concrete/ justified logic in it...
And critics, put an exact words on this...
http://www.koreaboo.com/kdrama/netizens-claim-new-k-drama-descendants-of-the-sun-is-completely-overrated/
Way way way 3,000x better than DOTS, buddy!