This is a really nice reborn/revenge-plot story that might have a simple storyline but contains all the ingredients it needs.
Character wise:
The Second Prince is a ruthless and power hungry man that will stop at nothing (including eliminating his brothers) to become Crown Prince and later ascend the throne.
FL is the daughter of a powerful General and the obvious choice for the Second Prince to marry - and in her first life he does, since FL sacrifices her own happiness for her family.
The Emperor’s Nephew is a warm and caring man who grew up with and loves FL wholeheartedly. He will stop at nothing in order to protect FL - even at the cost of his own life.
Acting wise this is very good and the actors do a fantastic job with their characters.
Well, if you love a good reborn/revenge-plot with a solid storyline, this is definitely well worth watching.