Well, 'Solo Leveling' also has elements of romance within its manhwa. The story mainly focuses on the protagonist's journey in a dangerous world but there are some romantic undertones in his interactions with certain characters. Also, 'What's Wrong with Secretary Kim' is a great romance manhwa novel where the boss - secretary relationship takes an unexpected romantic turn.
Yes, it is. The Solo Leveling manhwa has become very popular for several reasons. The action scenes are intense, the power-ups are thrilling, and the overall theme of growth and overcoming challenges resonates with a wide audience.