Yes, it is. The fact that it's based on a true story gives it an extra layer of authenticity. The characters seem more real and the events are often more impactful because they actually happened.
Well, another option could be Hulu. Sometimes they also feature movies that are based on real events. However, it really depends on the licensing agreements that these platforms have. If it's a relatively unknown movie, you might also want to check out some independent movie streaming services or local video rental stores that might carry it.
The story of Solo Leveling is about a weak hunter named Sung Jin - woo. In a world filled with dungeons and monsters, he starts off as an E - rank hunter, which is the lowest rank. But he gets a mysterious system that allows him to level up and become extremely powerful over time. He faces various dangerous dungeons and strong monsters, and gradually rises to become one of the most powerful hunters in the world.
You can start from the chapter where the anime ended. Usually, there are online forums or manga communities that can give you the exact chapter number.