Spoilers:
Dragon is pregnant. He gives the inner elixir to save the ML without telling the ML bc he is afraid ML would kill him to get his heart for the empress medecine and kill the child at the same time. ML locks the dragon in cold prison without food. MC is almost SA by guard and ML say MC is a b*tch, the child isn't his. MC is in labor in prison, he is too weak to survive, he burn his soul for his child protection bc he is afraid the child can survive without him. Also he takes his heart out begging ML to spare the child in exchange and then turn into ash without any chance to reincarnate.
ML is depressed and refuse to see the empress who give birth to a red eye child (a demon). Empress is expelled to the cold palace then dissapear. 2nd ML usurps the throne and kills ML. ML returns to heaven and the redemption arc begins.