The Glory After Rebirth - Chapter 561 - Spin-Off - A Journey to the South Ocean (19): A Subterranean Palace

Wyatt Jacob, a young man who hated the profession he once loved as a marine biologist after being brutally castrated and sexually assaulted by a pod of dolphins, had lived his life with pain and suffering as an impotent man having no other choice than to continue his work as a marine biologist with the emotional trauma that now accompanied it to earn a living.

But that was until he met the 'Happiness god' who granted him the chance to be reborn in the 'World of Tharcania'. A world filled with wonders and mysteries as 'a pirate; -'a prince exiled by his empire and thrown into the sea.

Now given another chance to live his life with his little brother intact, Wyatt will sail the seas of the 'World of Tharcania', exploring its beauty and wonders with the various pleasures that came with it.

My older brother, who was my only family member, lost his memory. “I have a sibling? Are you kidding me?” He was a fool who cared for me ever since he brought me from the temple… “I can’t even take care of myself, so what is this…” I left the family because I didn’t want to be a burden to my older brother, who had no memory, and was helpless in the tragedy that followed. So I turned back time. That too, to the point when my brother lost his memory. “I don’t have anything in my head, so I don’t know what to do next. What if I have a kid with me?” We must not repeat the tragedy of the past life. So I grimly said, “That’s right. I don’t have anything on my brother’s head right now.” “…What, what?” I chuckled and took out a document I had prepared. The contents of the document, written in crooked, large letters, were simple. [I transfer all the property in my name to my younger sister.] While my gaping older brother was checking the documents, I took out his seal from his drawer and smeared it with ink. Then I put it in his hand and said with a very sad expression. “So stamp it. Now.” I will protect you in this life.

An accident gave Ye Han a magical ability to see through. Since then, his life has become rich and colorful. He has developed the strongest business empire, dominated the gambling world, and rejuvenated his medical skills. He has become a master of medicine and Taoism. The goddesses rushed towards him one after another. As a man, and a limited edition man, Ye Han was under a lot of pressure and had to go on an exploration with a few tomb robbers. However, a shocking secret from ancient times to the present gradually emerged. in front of him!

- Description from novelbuddy

To be exact, the female lead is an “older sister” type, amid many beauties and handsome guys, she's no white lotus.Also, it's said that the name of this book is the same as a brand of sheep's milk powder.