Greatest Boss System

You are reading Greatest Boss System manga, one of the most popular manga covering in Action, Adventure, Fantasy genres, written by Feng Qi Yue at MangaPuma, a top manga site to offering for read manga online free. Greatest Boss System has 137 translated chapters and translations of other chapters are in progress. Lets enjoy.
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Who is he? Why is he called the Boss? Maybe he's the fearless ruler of the world. Or maybe the worst enemy of humanity, who tears worlds down. After Su Sin was reborn, he lost all his skills and abilities from former life in a knights' world. However, a newly implanted System can help him restore them. "My name is Su Sin where Sin means Promise keeper".