Rowoon is handsome as ever but his comedic acting is far better in Destined With You. FL well suited to the role and I'll be on the lookout for her other works.
The story is entirely entertaining--the only 'cringy' plot is the pairing of a teenager with a 27 y/o---in actuality I don't think the marriage would have been endorsed given the rank of the groom and the purpose (in those days) that a wife is chosen to bear heirs and provide political support from her family.
What works is that romance is in the air among several couples and it makes sense for the whole story vs. typical romances where you wonder why there is a second or even third couple story except as filler to make the drama long enough.
The intrigue and twists work to propel the story forward as well. And the actress who plays the Matriach hits it again in this role being evil but for a reason ..consider The Red Sleeve where she plays the senior court lady.