2252 Book(s) Related to my rival stepbrother is now my roommate

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!

Three years ago, I gave up everything and went to prison in my younger brother's place. After getting out, they humiliated me and even made me sleep in the storage room. Everyone mocked me as a murderer, called me trash. My fiancée's parents also looked down on me.
But they didn't know that during those three years in prison, with the help of a mysterious old man, I had already awakened as an alpha werewolf...