The K2

both have similar situations: politic, powerful people behind scenes, puppet politicians, agents, conspiracy, power struggle, enemies and allies ... multilayered characters and unexpected situations/story developments, when you don't know who is whose enemy or ally, what will happen next...

in both dramas there are characters who you start hating/loving in the beginning but then change your mind, or often you just don't know are they good or bad.
also in both dramas we have "bad person" characters who are so smart, strong and charismatic we love/hate them....

overall both dramas are "multi mains", with many well developed characters, so we could say they are mains. neither of this dramas are one or two character shows, though in K2 we have more obvious male lead and he is above all.

both have strong women characters, though SFL in the K2 is incomparable.

both have little romance as side story (though in DS60D it's really side story and very little, when in K2 romance was forced to be more on front and I think it was main issue with that great drama)

****Main difference is: K2 has lots of actions and badass/physically fighting ML who is center of the show, so drama is somehow more "adventure". But if you liked K2 not only character K2, then this drama is also for you.

Both dramas deal with powerful plotting women and men that are changing sides. In both dramas a murderer plays an important role and involves nearly all the people.
Although the K2 has more action to offer for now, the suspense and the mystery and plotting between the characters is a lot similar.

University student, Takatsuki Minato, likes things to be clean and in order while her stepbrother, Takatsuki Toru, is a bit of a player. One day, while cosplaying as a high-school student in a fashionable district in Tokyo, Minato accidentally bumps into Toru and quickly lies about her identity. To her surprise, Toru appears to take an interest in her alternate identity, Mina, and asks her out. Thinking that she might be able to cure Toru out of his playboy ways, Minato continues to disguise herself as Mina but will she be able to keep up the charade when she starts developing feelings for Toru?

Both drama the male lead are body guard. Female lead was from rich family. Romance occured as time goes

These dramas just give me the same vibe. Both of the male leads have a mysterious past that continues to haunt them. Both dramas have political maneuvering in which the male leads are used as pawns in plays for power. And SADLY both dramas have female leads that have like ZERO personality, are REALLY annoying and basically sabotage a drama that could have been a lot better with a competent, likeable female lead.

Both are action packed dramas with large scale conspiracy behind the scenes. The main protagonists of both dramas are victims of this conspiracy and are out for revenge. Romance is also an important part of both dramas, although maybe a bit more in Iris than in The K2.

While watching The K2, I kept thinking of The Great Doctor:
-MLs were alike: had similar personalities and sad backgrounds, being haunted by dead past loves and killing, both very skilled fighters, were still kind and cared about others despite pasts, were dedicated to protecting the FLs, and found new love and healing in the FL
-Music and fight scenes had similar vibes (even though one was martial arts and one was swords)

In both the ML get the job to protect the FL. The first as soldiere the other is ex-soldiere.
In both dramas, FL and ML get to know each other better and fall in love. But there are a few obstacles in there way to happiness.

If you like bodyguard dramas watch both.

The male in K2 is also a bodyguard. The female lead is the person whom he is responsible to protect but they eventually falls in love with eachother.

Follows a former mercenary who becomes involved in high-level political and security conflicts. Features bodyguards, covert operations, and military-style action.

both FL holding critical position where they are assassin-ed in K2 FL is political leader's daughter has birth secret which cause her trouble ML ex army man who appointed as her bodyguard during this duty he fall in love with her. the crown princess is story of princess who appointed as the crown princess and her journey cause of her position she is target of assassin so a navy officer appointed as her body guard and in end fall in love

Both shows are heavily focused on martial arts and action with quick pacing between massive highly choreographed fights. Both shows involve corporations, betrayal, and the criminal underworld

The relationship between Ji Chang Wook and Song Yoon Ah (Madame) in the K2, is very similar to the relationship between Jang Hyuk and Lee Mi Sook in Money Flower. Even though Ji Chang Wook is my favorite actor and while the action in the K2 was great, overall Money Flower is a better drama.

Both Male leads are body guards and female leads are rich girl with some sort of PTSD.

In both dramas, the male main lead is framed for the crime he did not commit and is on the run but later returns to take his revenge on the people who cause his pain .