Both include the bts/process of making dramas, as well as relationships, with main lead pairs in both being a writer & pd.

TheKingOfDramas more action-filled and fastpaced, BeMelodramatic more realistic and heartwarming.

Female-centric plots in both, with women at work and their sismances.
WWW working with search engines, IAmLegend with Music.

Female-centric plots in both, with women at work and their sismances.
WWW working with search engines, Legendary Witch about Baking.

Both Women-centric business dramas (a rare thing in dramaland), women in technology related fields.

Both a female power type plot. Strong career women.
WWW more like a comedy while SKY castle is darker BLACK COMEDY/melodrama esque.

Both show some GIRL POWER.
WWW about 3 career women with search engines;
Busted is an unusual variety show that's more like a variety show & drama combo with a pre-written storyline under which the members solve crime detective problems/challenges. Alot of it feels more like watching a thriller detective drama than a variety show.
And PMY in season 1 was the one doing 90% of the work LOL while the boys failed most of the time. So girl power there. XD

Both centered on female power.

WWW about 3 career women working with Search Engines;
ThePainterOfTheWind about a female painter who dresses up as a boy in Joseon era and is a better painter than any of the boys.
Both have a bit of romance too.

Centered on strong female power.
WWW about 3 strong career women working with search engines;
Big Issue about 1 strong career woman being the CEO for basically a parody on korean Dispatch. XD (Tone of drama is serious thriller though)

Plot centered on 3 strong female leads and sismance.

WWW about work life females and Avengers on revenge plot on the ones that have wronged them (including revenge against their jerk husbands).

Both about strong female leads and their sismances and romances.
WWW has 3 strong females working w. search engines in focus, AngelDestiny about 4 sisters working in hotel business and their sisterhood bond is super sweet. :) Angel Destiny has both heavy romance focus and sismance focus, the males have some chasing to do too, some of them resist the males well. :)

Female centric dramas.
Both about 3 career women in their 30s, their sismances and romance. Focused heavily on strong females.

WWW about 3 search engine career women, while Melo Suits me about a Drama Marketing Team Director + Drama Screenwriter + Documentary PD.

Both very dark melodramas with a very handsome male lead going through great psychological pains.

Both feature "romance" but with a cynical tone.

Both have the same GREAT STRENGTH of Drama:
LAYERED CHARACTER INTERACTIONS that will make you think.