O Rei das Compras Louis (2016)

Both are about a poor country girl who lives alone with her grandmother. She decides later to move into the city.

These two dramas have a similar feel. Both main characters start to live independently and need to financially support someone completely oblivious to the rules of the world. Both dramas also emit a feeling of a loyal dog and its owner.

Almost same plot
Only it's amnesia instead for Shopping king Louie.
They both give similar feel.
Rich ML saved by a poor FL.

In both dramas:
-The male lead has lost memory and is taken care of by a girl, their family think they are dead.
- Both male leads are kind and cute.
- Good chemestry for the main couple.
- The male leads are from rich families.
-The female lead loses someone of her family she loves at the beginning.
-The female lead is much stronger than she seems at first sight.
-There is someone who wants the male lead to disappear because he wants to take his position in the company.
-The supporting characters are interesting and appealing.
-The female lead ends up working at the male lead's firm.

Points of divergence:
- In SKL, the guy loses the memory once whereas in STLDFM, the guy loses his memory twice, and falls for the female lead once again.
-In STLDFM, the second male lead falls hard for the female lead, whereas in SKL, the love triangle is less highlighted.
-In SKL, the couple is more childish and it is a comedy with a light storyline.
-In STLDFM, the story is more tragic, the storyline is heavier than in SKL but there are still some comedy elements.

I loved STLDFM better because of the casting (Eugene and Ji Sung fan) and the storyline. We really felt the love all along this drama. (I am a bit sad to know that later on he married the girl playing the female rival of Eugene, and not Eugen herself????) Both dramas are good even though STLDFM is older, but in my opinion old dramas are the best because modern dramas lack something older dramas had. If you want a light drama, watch SKL, if you want to witness the birth of a "once in a lifetime and strong love" conquering all, watch STLDFM.

In both drama the main leads who are very rich lost their memories and meet a poor person by chance

Normal people learning and stumbling, winning and losing, understanding their own value, and especially dreaming a lot, is the best experience this show leaves us. It's unusual but energizing to find a drama that focuses on characters struggling for a dream or struggling to find it.

The male leads are both very soft-hearted.

The female leads are both very hard working.

The plot might not be very similar but at some points it has the same vibes

Even though their plots are different, both ABM and SKL had kinda similar vibe in terms of cohabitation trope and a naive yet funny male lead who's completely dependent on the female lead as he is unfamiliar with the outside world. In ABM the ML is an angel with lost powers while in SKL, the ML is a rich heir with lost memories.

Both dramas are a rich guy, poor girl drama. Shopping king louie and Kim Min kyu have very similar personalities. They're similar characters: Grew up alone in a big mansion, no parents, lonely, both are very pure and adorable characters.

Not that the plot is similar in any way, but it's a similar vibe - warm and fuzzy characters, all the people in this drama are nice and good people that understand others. Relationships are healthy, be it work, friendships, families, or romance. Lead couple has amazing chemistry. A simple story with really good developed characters.

Both have the concept of the frugal FL teaching her way of life to the ML after the ML lands in trouble for his way of spending money

The setting is the same. Both dramas have the same feels, since in both dramas a rich guy (in rooftop prince the guy is a prince from the Joseon era who ends up in modern-day Seoul and in Shopping King Louis the guy is the heir of a conglomerate) becomes poor and has to learn how to live a normal life with a poor woman who takes care of him.

It bot have memory loss it"s a great show to watch, and shopping king Louie took me to this show.
the drama might be long, but it's worth the watch even for me i took me three days to find it and the story was in my head to hole time and i found it XD.

The plots aren't the same at ALL, but the feeling they leave you with are very similar - cheerful and optimistic. Again, please note, the dramas are not similar at all in plot, but good feelings all the way. :)

They have the same kind of fluffy feeling in the beginnings and the way Joon Jae has to teach nearly everything about the world to Sim Chim Chung is similar as Louis hardships to get know the world. So in SKL the girl teaches the boy about how to live a normal life and in LOTBS the boy teaches the girl.
One more thing: in Legend of The Blue Sea Joon Jae forgat Shim Chung because she erased his memories. On Shopping King Louis he also forgat everything because he had amnesia.