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”.
Greatest Boss System is finished and has null Volumes and 321 Chapters. It is also Known as: Zuì qiáng BOSS xìtǒng, Система Сильнейшего Босса
Genres: Adventure, Action, Fantasy, Martial Arts, Shounen, Isekai
