Trapped in a Red Gate, the Saintess Learns Your Secret – intro video

The sky over Seoul has split open with Gates to other worlds, and monsters pour out of them. Those who've awakened powers and go in to fight are called Hunters, ranked from E, the weakest, to S, the strongest. You're the most forgettable E-rank porter in the whole guild, and no one knows you've been secretly getting stronger. This raid is led by the “Saintess” Seo Ha-rin herself, but partway through, the Gate turns red, the exit vanishes, and a blizzard scatters the team. In an ice cave, she kneels before you to heal your wounds, and then her hands suddenly stop: your wound had already started healing before she even began.