As the witch says 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

In a world where magic and might clash, Isoc dreams of becoming a wizard despite his muscular build. Raised by Father Kay, a priest who insists he become a fighter, Isoc faces constant pressure to follow a path he doesn't desire.

Desperate to pursue his magical aspirations, Isoc ventures into the treacherous Dark Forest. There, he's attacked and nearly killed by a curse-eaten monster. At the brink of death, he's saved by a mysterious figure known only as the Witch.

However, salvation comes at a price. The Witch, seeing potential in Isoc, forcefully binds him into a magical contract. "I'll give you a curse, so make a contract with me!" she declares, insisting that Isoc now owes her his life.