Okay, I’m guessing consort su knew that consort rou was favored by the emperor, so when consort rou gave birth, she had someone switch out the baby son with a baby girl(not eligible heir). ml is actually the son of consort rou and either the mc’s dad was involved or found out the truth of the switch at birth, and that’s the reason why mc’s dad was killed.
Okay, I’m guessing consort su knew that consort rou was favored by the emperor, so when consort rou gave birth, she had someone switch out the baby son with a baby girl(not eligible heir). ml is actually the son of consort rou and either the mc’s dad was involved or found out the truth of the switch at birth, and that’s the reason why mc’s dad was killed.