A good way to gauge the creativity of a writer is by how unique the premises they write are. There are a plethora of sci-fi manhwa out there that touch upon the 'time-traveling' genre in one way or another. Isekai, reincarnation, and power-scaling manhwa have some sci-fi elements in them, regardless of how they're developed throughout the course of their run. For example, the concept of alternate realities and dimensions is one of the most prevalent concepts in Solo Leveling and similar manhwa. Similarly, transmigration and 'going back in time' are quite dominant in a lot of the popular romance-isekais, like Doctor Elise: The Royal Lady with the Lamp or I Shall Master This Family.