I was more overpowered than the hero, so I hid my power! is a Manga/Manhwa/Manhua in english language, Action series, english chapters have been translated and you can read them here. You are reading chapters on www.mgeko.cc fastest updating comic site. The Summary is

“Ever since I was a child, I’ve loved the ‘normal and light-looking but hides his strong powers’ type of character. And then, a chance for rebirth came! “What would you like to be in the new world?” they asked. “I want to be someone who hides their true powers and strength!” …But I didn’t mean it to be like this!?”