Kip. 1: You Aren't E-Rank, Are You?

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Jinwoo attends Jinah's parent-teacher meeting, where the teacher asks him to persuade Han Song-Yi, a classmate of Jinah's who has decided to leave school and aim to become a Hunter. To show Song-Yi the harsh realities of the Hunter profession, Jinwoo takes her to observe the training ground of rookie hunters at the White Tiger Guild. However, upon stepping into a C-rank gate, the surroundings suddenly transform, bathed in a red glow, and they are completely cut off from the outside world. It turns out to be a Red Gate that connects to an advanced dungeon. (Source: Solo Leveling Wiki)