I walked into the school beauty’s private room by accident, and the nosebleed I got made me stronger

What the story is about

After transmigrating into a world where people awaken combat classes and explore dungeons, Gu Yu receives a supposedly worthless Berserker class—but secretly gains permanent stats whenever he takes external damage. He exploits the unusual ability to grow rapidly, leading a team of classmates through dangerous dungeons while attracting the attention of powerful families.