I will put it in my order of preference, from best to worst. I know I could write more about it, but if you like something, you should be capable enough of finding more information (pictures may contain slight spoilers, so take care). Here you go!
Tower of God. The first part is one of the best I´ve read, amazing world, great setting. Shame SIU (the author) changed the pace and story a bit in the second part, but hey, still a pretty amazing one. For me, at least so far, the best manhwa. Only one question remains - are you afraid of the Night?
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The Breaker: New Waves. Although I just hate the pacing in this one and I know it is called a Breaker for a good reason (the amount of pauses is... well, you will see), it is good. Like really good. Fighting manhwa with proper plot, awesome fights, great main hero and even the bad guys are pretty wicked. Do really try.
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Magician. A tale where, once again, a new world rises. Magic, swords, epic journey.. death. Buckle up and go for a ride. Right now the second part ended, so it is the best time to leap into it. One might say that magic users are overpowered, but hey, you will see for yourself. In Time(h).
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Noblesse. Another great manwha with humour, the best looking fights so far, although a bit repetitive (think of One Piece in the beginning). Still great and cool, though. There is especially one character that just has to be adored. Answer the call, puny human.
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The Breaker. Might be above Noblesse, but hey, it´s been quite long since I´ve read it. Solid piece of work, great battles, all of the characters have some background and motivation, but I still like the New Waves more. Read before the sequel though.
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The Gamer. If you are familiar with various games and MMO, you will probably love this one. Interesting abilities, special characters, but most of all - funny as hell. Gotta love that grind.
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Black Haze. My newest addition - it is nice, but missing something. The magic is not as great as one could hope it to be, the characters are a bit flat, the whole world does not make so much sense. But the main character is quite likeable and it does have several epic scenes. Rather read the stuff on top of this list though. But maybe, one day..
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Ability. The weakest of the manhwas I´ve read so far - it bears resemblance to Noblesse, quite generic, haven´t produced new chapters in a while. But still, quite the nice read.
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I have some I haven´t read yet, such as Veritas, Yongbyeong Maluhan or Shin Angyo Onshi, so I cannot tell you about them, but they should be pretty solid. Hope you will like the list and pick something If you want to know something more romantic or different from all the fights and grinding, I might suggest For the Sake of Sita or Orange Marmelade.
Also, someone mentioned Feng Shen Ji - although great, I believe it´s manhua, therefore Chinese. But a pretty cool one.
Distant sky : The plot is in korea and the main character is boy whose name is Haneul. when he wake up he see pitch black nothing else. No electricity , no stars in the sky no water and food.Ongoing.
Kubera.: The main character is female. The girl with the name of a god.Onher birthday she went out of town inorder to search curry mushrooms when she get back she founds that her village destroyed by a creature.
she wants revenge. She is rescued by a strict magician named Asha rahirngoing
Lucid dream: It's about lucid dream.It's completed.
