Haa what an ass i hope his mistress betrays him in the bitchiest way she can

That's not his mistress but his concubine (I think). People keep forgetting that this is a historical drama and that as an Emperor he is required to produce as much heir as he can. Therefore he is required to sleep with many women in the harem. And people are also forgetting that this "mistress" also did shitty things her own like seducing the emperor when he was a minor, plotting to abort the queen's baby if she ever gets pregnant, etc. BOTH the emperor and the Sister-in-law deserve the same fate in my opinion bcz one is just as bad as the other.