My Sister's Dungeon Adventure, My Identity as the City Lord Exposed

The Abyss is reviving and will soon engulf Blue Star. Lin Xuan binds to the [Dungeon System]. The bigger his dungeon and the more monsters he recruits, the stronger he becomes. From then on, by day he's a college student, and by night he's a dungeon lord. Abyssal lords and billions of monsters successively submit to his command. With his strength alone, he keeps the entire Abyss in check! Humanity knows nothing about it. That is, until the Abyssal Lord partially revives and opens a passage between the Abyss and the surface. In no time, people across Blue Star become adventurers and explore dungeons. Lin Xi, Lin Xuan's younger sister, also sets off on an adventure during the summer break after her college entrance exams. Little does she know that this journey will be one she never forgets. “This crystal bracelet has a light-element forbidden spell sealed inside it: Hymn of Holy Light?” “I don't know! My brother gave it to me for my eighteenth birthday!” “This greatsword is an ultimate divine weapon?” “That can't be. I took it from my brother's room. It's a cosplay prop!” “Hey? Why are all you monsters lining up for me to kill you?” “What do you mean, you're following my brother's orders and helping me reach max level?” The people of Blue Star: “Who on earth is her brother?!” The Abyssal Lord: “Damn Lin Xuan! He's too lazy to fight me himself, so he's training his little sister to do it instead!” Lin Xuan: “Want to go a few rounds with me?” The Abyssal Lord: “…”