Recommendations

They both have a similar dark vibe and story. The ambience and the feeling is alike.
However, the male lead in this drama is similar to the female lead in My Ahjussi. He has a tragic past, and he is close to a relative who is disabled, and tries to overcome his hardship, and eventually becomes bad, and tries to get revenge. It's an interesting drama that follows his story, as well the female lead who is also overcoming her own struggles.

Its slightly the same .
The female lead in the beauty inside changes to a different body and new identity for one week a month while the female lead in only kiss without love changes whenever she is kissed by any mammal.but the similarity is the change of bodies in both series
Both dramas are dealing with contract relationships
Both dramas have rich male leads.

Super fun, cute characters, handsome cold-faced but warm heart male x cute bubble crazy female. The female is the one chasing for love. Super sweet!

Same basic plot, popular, smart, handsome guy ends up living with relatively normal girl after accident.

Both are about the dream of flying.
In contrast to the NKOL , TE is more all-rounded:well developed and finished story with a hint(not the dominant aspect) romance .

Both drama show the bond between friends ,which train to protect the country.
Have similar feeling.
The huge difference is that in AMA the romance is more dominant. TE is more about the development of every character and the difficulties they go true in order to realize their dreams .
Would recommend watching both of them .

Both have the same writer Yoo Bo Ra, both create an unique subtle world, both have a beautiful music.

Both stories will give you life and destroy you. Both are about obsessive love that's beyond the boundaries of right and wrong

I love Double Mints absolutely just the way it is but if you want a less dark version of a story set in the crime world History Trapped is perfect.

Similar feel with the main leads sticking with each other.
Romantic
Cute
Male lead chases female
strong male lead

There’s cross dressing in both. Although, Jang Dong Yoon is more convincing. The romance of both first stems from a friendship. Both male leads are handsome and female leads are young experienced actresses.

Not so much of continuation of the first season. The detectives are still the same but the stories are as usual: very episodic and so good!

The younger version of Furuhata the original. Yamada did the character good. The mystery itself is very interesting, although it differs from Furuhata's way of trapping the criminal. Maybe because the young kid is still a kid but overall very intriguing.

They have different plot. But both drama has the same setting, a mystery of a student's death, and bullying.

I wouldn’t say: if you like QSD then you'll like EK. I’d say: if you feel that QSD lacks smth, watch EK and vice versa.

In 2009 QSD had madly high rates at the Korean TV.
That’s why in 2013 the EK writers took the QSD plot pattern as the success formula: a smart strong female lead goes up to the royal power, first she cross-dresses as a boy, then fights against an evil chancellor. There are some male leads for who she is a love interest: one is virtuous and very pragmatic, another one has unhealthy psyche. There is the third character (very cute) but there are no romance between them, alas.
QSD has a lot of complicated political affairs, mind games, multidimensional characters but it lacks romance, pathos, adventures.
In EK writers added all this and made a more vivid teenage version of the same plot. Also they made the characters not so complicated and made the female protagonist even supersmart and superstrong.