Strongest Level 1 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

Unbeatable Lv. 1, 최강 레벨 1, Strongest Level 1 The raid failed. In a desperate situation, facing the dungeon boss’s self-destruction, Lee Geonwoo is left alone in the boss room due to a teammate’s betrayal. Just when he thought everything was over, he coincidentally obtained a dagger. Afterwards, his life completely changes… He managed to save his life, but not only did his hard-earned level return to 1, -‘Mosquito’ has been caught. -Level has increased. It’s clear that the level has increased, but why does the level remain the same?