I Stole the Number One Ranker’s Soul

I Stole the Number One Ranker’s Soul manhwa, ランキング1位を手に入れてしまった, 랭킹 1위를 영혼까지 털어버림
One day, Son Mo-Ah fell into a dungeon and became a gathering hunter. Son Mo-Ah, who somehow narrowly escaped death, was going to live a normal life but gets caught up in a dungeon yet again. In a moment of crisis, she is rescued by Seo Ji-Han, the number one ranker, and succeeds in surviving the situation. Somehow, Son Mo-Ah got entangled in a fateful relationship with said number one ranker. But he said something really unusual to me. “Promise me that you will kill all the dungeons bosses in this world, as many as you can.” What?