Starting to think season 2 isn't guaranteed

This is possibly the best Kdrama I've ever watched, and we're all waiting for season 2 but it keeps getting delayed. The director postponed it to work on another project which clearly shows he doesn't care as much about aouad. The main cast are all rising stars in Korea and they've each taken on at least 3 roles in other dramas, they can't wait forever just to film s2 as anything can happen and if any one of the 4 leads are missing it's gonna be a huge disappointment. I know they said they will start filming this year but is it really going to happen? Has Netflix ever renewed a show and then cancel it? I'm getting pretty concerned now that we haven't heard any news or updates for a long time