100 Days Husband is basically Shopping King Louie but set in Joseon Time period.

A rich young man who has memories of the female lead whether he remebers them or not, loses all of his memory and gets lost, the female lead finds him.

Now, that he has lost all of his memory and has no memory of where he lives or who he is, the female lead and him are forced into living together. At first, the man useless and buys items that cause the woman to go into debt because he has no money of his own.

The female lead forces the male lead to get a job, but, the male lead is found to be very bad at that job, until they find out what he is really good at and he regains his memory. For a time the female and male lead live apart since, the male lead was found by his family and regained his memory, but later on, the male lead goes back to get the female lead and they live happily ever after the end.

Also, to make it more confusing the female lead in these two kdramas are played by the same actress Nam Ji-hyun.

But, 100 Days Husband is a better kdrama because it fixes the problems that I had with Shopping King Louie.
Politics added to the drama and made it less boring to watch and kept my interest even when the main couple had to be separated for a time. I found that the characters in 100 Days Husband felt more like real people who were going through real struggles.
For the casting/acting, D.O. and Nam Ji-hyun had great chemistry and really I could not imagine anyone else doing their characters as well as they did in the story.
The music in this Kdrama fit along with the storyline and tone and helped bring a certain atomsphere to the show. Kim Jongdae sings an OST for this drama and that is not the only song that is awesome in this drama.

The rewatch value for this drama is high as all the parts of this kdrama feel needful and add depth to the characters in the story.