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I was reading a manga that only has 18 chapters and a little Light Novel of Forbidden Master and Disciple Breakthrough ~What's Wrong with the Hero's Son Being the Devil's Disciple~ It's depressing to know people will want to compare the child to the hero who saved the world from the Demon king, never acknowledges his efforts despite being top2-4. Competing with other children of the 7 heroes being neglected by his parents, constantly being berated and lectured. Only to find out the people who truly cared about him was a Demon King that died 15 years ago. The kid is only 14 years old and he was belittle by everyone even his childhood friends. The demon king teach him how to excel and accepted him for him. He wants to be recognised by his strength and not his lineage. After displaying the forbidden magic that was once used by the Demon king. He was further ostracised with people wanting to exile him to executing him because of the remnants of the Demon kings power. With his attempt to shut the crowd one last time, he told his father that he wish he hadn't been his son or was ever born and dissappeared. His conquest now was to surpass his father accomplishment but travelling the world and learn that despite the war ending, there are still prejudice and discrimination toward the Demon folk after befriending a kind hearted Orge. This should be in Manga post