The magic of a returner in the manhwa and anime is very special. It usually comes with hidden powers and unique traits that drive the plot forward and make the character stand out. Also, it might have some rules and limitations that add to the complexity and excitement.
The specialness of a returner's magic lies in its rarity and the way it gives the character an edge in various situations. It might have unexpected effects or be tied to a profound backstory.
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.