The blonde girl isn't a real princess/royalty. She rebels, attempted to kill both the Emperor and mc to take the throne. It is revealed that she's a fake and Emperor's memories where tampered. He has never been with anyone other than MC's mom. Blonde girl only has a similar eye color as royalty, originally she's a farmer's daughter.
Blonde girl was never really punished for her crimes. They let her go, her title as princess was revoked and mc has her happy ending with her dad and ml. And yes, it was so unnecessary long and some things didn't make sense, but that's the gist of the ending.
The blonde girl isn't a real princess/royalty. She rebels, attempted to kill both the Emperor and mc to take the throne. It is revealed that she's a fake and Emperor's memories where tampered. He has never been with anyone other than MC's mom. Blonde girl only has a similar eye color as royalty, originally she's a farmer's daughter.
Blonde girl was never really punished for her crimes. They let her go, her title as princess was revoked and mc has her happy ending with her dad and ml. And yes, it was so unnecessary long and some things didn't make sense, but that's the gist of the ending.