Leveling up Jinwoo's stats in Solo Leveling: Arise is the key to progressing through the story efficiently and getting through gates quickly. While you can choose between Strength, Vitality, Agility, Intelligence, and Perception, you only really need to level up two stats.

Always level up Strength and Perception for Sung Jinwoo in Solo Leveling: Arise, giving him at least double the Strength points of Perception. This is because you can build up Perception as you level up and increase the tiers of your weapons, while Strength relies more heavily on Jinwoo's raw stats.

Don't spend points on Intelligence, Vitality or Agility. Vitality and Agility are for extra survivability and critical chances, which can be increased with weapons, skills from other hunters and Artifacts. Jinwoo also doesn't rely on MP and abilities, so his Intelligence can be low because he compensates with powerful basic attacks.

For example, my Jinwoo has 144 Strength and 60 Perception, which gives me a minimum damage of 90 percent. This value is fine for the story stage I'm currently playing.