I was annoyed with the Empress Dowager when she objected to Ayushiridara becoming the Crown Prince of Yuan because she said he had Koryo blood
but she forced Concubine Park who is also from Koryo to have sex with the Emperor to give birth to an heir and overthrow El Temür.
I think one of the reasons why the Empress Dowager chose a concubine to carry the Emperor's son was to make the child a puppet like she did to the Emperor to control the Inner Court or the power in the palace.So she was very sad or shock when she found out that Concubine Park was killed while pregnant and Maha is not the real son of former Empress Consort Tanashiri. Actually Empress Dowager was very sad about the death of Concubine Park because she is innocent and her dead baby.
Good thing everyone found out the truth about Maha's identity and Ayushiridara became the Crown Prince of Yuan.