The ending to "Saimdang: Light's Diary" is more anticlimactic than anything else. The bad guys are almost immediately brought to justice because one essential character changes sides, and CCTV footage which should have been exposed, I don't know, a dozen episodes ago suddenly pops up out of nowhere and decisively proves that Jeong-hak was a fink all along. Meanwhile, in the past, King Jungjong is sad because it has suddenly occurred to him that persecuting artists is bad.
As for Saimdang, in a bizare twist, the production teams allows her to be angelic and forgiving toward Won-soo's adultery while still allowing her spectral form to cavort with Lee Gyum in dream world Italy. Incidentaly, it would seem that the Italians took Ji-yoon's discovery of a famous Korean artist who was active in the Renaissance a great deal more seriously than the Koreans did. The castle where all this got stated has now been fabulously restored.