the confusing end

I’m going to keep this as short as I can. The drama was pretty good. Been waiting for it ever since it was announced so i was very excited. The acting and everything was amazing but sadly the ending was really very confusing. It’s safe to say that I was truly disappointed with it. When i finished it my first thought was if there was another season or if maybe i missed something. I checked a lot but still do not understand the ending. There should be a new season or maybe a movie or sequel explaining this ending in my opinion.