Some people getting all worked up over the private lives of fictional characters. Chill.
People don't like it when dramas are messy and more realistic it makes them uncomfortable.. they want rainbows and butterflies with cutesy innocent love all the time... A lot of people had issues with Dark Blue and Moonlight too for the same reason but it was one of my favorite dramas when it came out
They have already cleared it in season 1 if you watch last episode after credits there is a scene of Xu qi'an…
They are advertising the spin off movie at the end of the last episode.. it's the back story of the alchemist who never showed his face...doesn't really say anything about a second season..