MTL - Doom Lord - ~ End this testimonial

The fake daughter was spoiled by her elder brother and parents, but she, the real daughter, was disgusted to death and scolded as trash, she endured it… But what happened this time? After the rebirth cycle, the eldest brother who hated her the most hugged her and said that he loves her. Is she his only sister? Several other elder brothers sent the most expensive gifts one after another, just begging her to take a second look? This plot is not right?

Brothers:

“Yanyan, do you eat candy? Big Brother bought it for you all over the country and put it in a candy house.”

“Yanyan, do you like this house? The second brother bought dozens of houses for you.”

“Yanyan, the third brother of the playground has been transferred to your name.”

“Yanyan, my brother will take you to debut at C position.”

Gu Yan: “…” (Help! She really wants to do the task in a low-key manner!)

- Description from novelbuddy

One day, I woke up only find out that I’d become a Demon Lord, an individual responsible for protecting a dungeon. The world I’d been spirited away to was one filled with violence. Gigantic monsters wandered through it and competed with each other each and every day for the right to survive. I had no choice but to strengthen my dungeon’s defenses in hopes of living another day—or at least that was what I’d thought. For some odd reason, I instead ended up spending my days in relaxation and bliss.