4th season

I'm so sad that there is not date for a 4th season, I feel terrible, upset this is the best drama ever. We need the 4th season. It can finish like that. I saw a season in one day. At first, I was mad because the change of actors but start to watch again and I couldn't help it and I fall in love once again. I think that a series need to be completed not matter what, is unfair for those Netflix costumers that are loyal. This happened before and is really unfair because you never know the end. I love Korean drama I really a fan. Please make 4th season.