I think 'Solo Leveling' has a great story. The concept of a weak hunter becoming the strongest is very appealing. The story is full of action - packed battles and the protagonist's growth journey is really inspiring. There are also various mysteries and political elements in the manhwa's world that add depth to the overall story.
One notable thing about manhwa in martial arts is the depth of world-building. They create rich and immersive martial arts universes. Also, the storylines often incorporate elements of strategy and personal development within the martial arts context.
I'd recommend 'The Remarried Empress'. It combines drama, romance, and fantasy elements really well. The chemistry between the leads is palpable and the story has depth. 'See You in My 19th Life' is also good. It has a touching and heartfelt romance that tugs at your heartstrings.