Shopping King Louie is literally the definition as to why I watch Korean dramas and I don't waste any more time on American TV shows. No, Shopping King Louie was not a "mature" watch, nor was it particularly unique. But the qualities it does possess are what make it perfection. Louie came from a wealthy family, so sure, he was spoiled, but he was far from a "bad" person. Actually, from the very first episode, he was extremely likable. Louie *was* humbled quite a bit due to everything he experienced while having amnesia, but it only made him a better-rounded person, it did NOT change him from a "bad" person to a "good" person, because he was already a "good" person. Bok Shil was so genuine and kind, but not to the point of frustration for the viewer. The romance between Bok Shil and Louie was innocent, sweet, and developed at a natural pace.

The side characters were all extremely likable, even Marie. The way the "greedy" family member is resolved truly broke my heart and how it was handled couldn't have been done better in my opinion.
The last episode had me in tears because it was heartbreaking and touching at the same time. I didn't expect everything to tie together the way it did in the end, but I'm so glad the writers had the forethought to wrap everything up the way they did.
There are no loose ends and I didn't find any plot issues that usually leave me questioning things. Everyone got an ending and the pacing was superb.

*And* EVERY SINGLE EPISODE HAD ME LAUGHING MY BUTT OFF. Which only added to the quality of the drama.
"Tiger Moth" by MONSTA X was an amazing OST and I keep listening to the original version as well as the acoustic because they're just so lovely to listen to!

I've seen Seo In Guk is some other dramas, such as Reply 1997, and while I adored his bashful and introverted character in Reply 1997, his silly and innocent character portrayal (completely different, mind you) was hilarious and expertly represented.
The only real memorable drama I remember seeing Nam Ji Hyun in was Suspicious Partner. Personally, I think she did a better job portraying such a kindhearted soul in Shopping King Louie than she did as an attorney in Suspicious Partner. Even though she really did do well in Suspicious Partner, I think I prefer the performance she made here.
This is definitely a drama I will rewatch in the future. I especially found the comedic moments to be so incredibly hilarious! Whenever Louie screamed usually due to a bug, would make me laugh out loud! His scream and high pitched voice when screaming was just sooooo funny!

My rating for Shopping King Louie is a solid 10/10 with absolutely NO reservations.
I would highly recommend the K-drama, Cinderella and the Four Knights as an equivalent to Shopping King Louie.