3 Book(s) Related to UNDERGROUND

I am the leader of the world's largest mercenary group. After retiring, I went to work as a bodyguard at the home of the woman who saved my life.
I hid my identity, wanting only to protect the woman who had saved me — until one day, her family fell into crisis. Everyone came to bully her, take everything she had, and even force her out onto the streets.
I stopped hiding and stepped forward. Anyone who dares to harm her will pay the price!

On the day the apocalyptic flood swallowed the city, I died on a fractured overpass.

The man who crushed my fingers under his boot was my brother-in-law, the very man I had sacrificed everything to support. And standing safely out of reach, watching coldly as the muddy torrent swallowed me whole, was my supposedly sweet and devoted fiancée. In her arms, she fiercely clutched her "son"—who was hoarding the last of my survival rations.

In the very last second of my life, she nestled into the arms of her ex-boyfriend and left me with a single, contemptuous sneer: "Let's go. Forget about this useless trash."

It turned out that working my fingers to the bone and emptying my life savings had all been a pathetic joke—a long con orchestrated by a pack of bloodsucking parasites.

But when I opened my eyes again, I had returned to exactly one year before the apocalypse began.

My fiancée was standing there, holding a cup of hot coffee and sweetly begging me to invest another million into her brother's business.

I just smiled, gently pushed her hand away, and turned around to liquidate every single asset to my name. With that money, I secretly constructed a state-of-the-art, deep-sea underground fortress.

Later, when the monstrous floodwaters inevitably tore the city apart, they stood on the balcony of their doomed mansion, desperately falling to their knees and begging my icebreaker for salvation.

Sitting inside my perfectly secure command cabin, I took a leisurely sip of hot coffee and softly gave the order:

"Open fire. Don't let this trash dirty my deck."

I am the worst "loser" in London's underground boxing ring, getting beaten bloody in every fight.
Nobody knows that I was once a top agent who struck fear into the hearts of the entire CIA—"Death" Marcus Kane.
Seven years ago, I was falsely accused of treason and forced to live in anonymity, making a living by throwing fights.
I just want to see my daughter live one more day, even if it means being humiliated like a dog in the boxing ring.
Until that day, I watched with my own eyes as my enemy poured my daughter's life-saving medicine on the ground and forced my wife to marry someone else.
I picked up that satellite phone that had been gathering dust for seven years...