K-Drama where main character (Male Lead) is Genius or he is great at what he does.

 homiesexual:

Sassy Go Go - the  ML is the best student at school

She was pretty - the ML is a skilled and successful editor

Solomon’s Perjury - the ML is smart and clever, he also plays the cello very well (I can’t remember if there is any romance here, there might be some, but it’s not the general focus)

Weightlifting Fairy Kim Bok Joo - the ML majors in swimming and is very skilled at it (although he has some problems, don’t want to spoil)

Signal - the ML is a skilled profiler (I especially recommend this show, since I didn’t think I’d like it, but was positively surprised) (there is little romance here though)

I already saw Sassy Go Go and Weightlifting Fairy but thanks. Maybe i should give a try to "Signal"-

Definitely the male lead character in Lion Pride (Taiwanese drama). He is a mathematical genius and is very quick to figure out things. Spoiler Alert: He is able to figure out a lot of things quickly, such as the female lead’s two other hidden alter egos. I love how things do not drag for so long because he is that quick on the uptake.  

These are Chinese dramas but really good

Ancient detective you can watch this on Viki  The story follows the amnesiac detective Jian Buzhi who starts on a quest to finding the truth and unmasking his father's killer. Along the way, he finds a love interest and a good friend who work hand in hand with him to solve mysterious cases.

The Taoism grandmaster is similar to the next one I’m about to recommend you can watch this on Viki. It has been foretold over three thousand years ago that the apocalypse is impending and that one Taoist grandmaster will emerge to save the world. To give the people a fighting chance, the immortals have gathered a team of gifted individuals in search for the sacred shield.

Fighter of destiny you can watch this on Viki is similar to the Taoism grandmaster in my opinion. Chen Chang Sheng was abandoned in a flowing river and found by a Taoist monk. Plagued with an incurable disease, he is fated not to live past the age of 20. Chang Sheng leaves his home to find a cure. During the trials and tribulations of his journey, he is joined by Xu You Rong and Bai Luo Heng.
(Source: Viki)

Legend of awakening you can watch this on Viki In the Five Dynasties and Ten Kingdoms era, young Lu Ping escapes the wicked forces of Shanhai Tower and discovers his spiritual identity in a moment of enlightenment – or rather, his spiritual identities, as he becomes aware of six distinct souls revolving through his being. When Lu later begins to train and grow under his teacher’s masterful guidance, he meets eternal brethren and earns the affection of the young miss Qin along the way. All is going well until a vision reveals his relationship to an unresolved crime in the martial arts world of a decade earlier.
(Source: iQIYI)