Regressor’s Life After Retirement is a Manga/Manhwa/Manhua in english language, Manhwa 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

By the same author that brought you Star Instructor, Master Baek After the first Gate opened in 2018, Lim Dae-In survived for 20 years on Earth while being connected to other dimensions. The day after his long-awaited retirement celebration, he regresses by 20 years, back to when he had nothing…