Looking for a webtoon

Does anyone know this webtoon? I dont remember much but i think there was a part where the a group of ppl, along with the mc, had to choose three doors. They were depending on difficulty, with the easiest one for only one person, i think? and the harder the difficulty the more people or allowed to go in. The mc and his friend went in the hardest one. I also remember there was some sort of death town or smth? And they had a test where they should kill the person in the paper which was given to them. Also there was this mage(?) with a hidden lab and actually made a new body that he could use? I think the mc stole some potions there. Tysm for anyone who could give me the name!(⌒▽⌒)