Moon River

It tells the story of the soul exchange between a prince who has lost his smile and a saddle-carrying merchant who has lost her memory.

Joseon Crown Prince Yi Gang, who lost his crown princess, gave up his own happiness and only thought about revenge. When Yi Gang's long-planned revenge plan finally took the first step, he met the saddle-carrying merchant Park Dal I who looked exactly like the deceased crown princess, and exchanged bodies for unknown reasons, falling into a series of chaos.

Moon River is like a redemption arc for Tale of Nokdu's. The ML of Moon river is also a key role in Tale of Nokdu. In fact, he plays the role of a grand prince in the Tale of Nokdu, which is similar to the position of the 2nd male lead in Moon River.

It tells the story of the soul exchange between a prince who has lost his smile and a saddle-carrying merchant who has lost her memory.

Joseon Crown Prince Yi Gang, who lost his crown princess, gave up his own happiness and only thought about revenge. When Yi Gang's long-planned revenge plan finally took the first step, he met the saddle-carrying merchant Park Dal I who looked exactly like the deceased crown princess, and exchanged bodies for unknown reasons, falling into a series of chaos.

Both royal MLs are haunted by the deaths of their beloved wives, both FLs are lower class. Both dramas have a similar vibe.

Noble/rich male lead thinks the woman he loves has died.
Years later he comes across a lowborn/poor girl who looks identical to her.
Female lead has lost her memories and does not know she truly is male lead's long lost love.