The Cursed Seal World

After Ning Yusheng awakened the weakest cursed seal, his girlfriend ran off with someone else in just half a second. He resolutely became a cultivator and ranked first on the academy's combat power list—though only from the bottom. Little did he know, a great being from an unknown world was residing within him! ... "Child, let me tell you about a man who once shared a room with me. He used a black cursed seal to become the strongest cultivator in the entire Tianzhou!" ... — Description from novelcodex.org