You can read it for free on Webtoon https://www.webtoons.com/en/canvas/insomnia-bl/list?title_no=24952 But, if you want to support us, we have an uncensored archive of Insomnia on our Patreon. It's in jpeg though, not in pdf. But totally downloadable.
they’re not supposed to help you just because they’re good at drawing. it takes time, effort and skills to help someone else and I wouldn’t do it for free either, even my friends.