Isekai manhwa refers to Korean comics where characters find themselves in otherworldly or parallel dimensions. It's a popular genre that offers exciting and imaginative storylines. Sometimes the characters gain special powers or have to overcome various challenges in these strange new worlds.
One characteristic of completed isekai novels is the concept of the 'fish out of water' scenario. The protagonist is suddenly in a new and strange place, like in 'Konosuba'. They also often have elements of adventure and discovery. The main character has to explore the new world, find resources, and face various challenges. Additionally, many completed isekai novels play with the idea of changing the new world according to the protagonist's will, as seen in 'The Rising of the Shield Hero' where the hero tries to reform the unjust world he's in.