Well, in many of these fanfictions, the theme of mutual respect between Sung Jin Woo and Woo Jin Chul is quite prominent. They respect each other's abilities and decisions. Adventure is also a common theme, as they embark on various quests or missions together. There's also the theme of growth, both as individuals and in their relationship with each other. For example, they might learn from each other's strengths and weaknesses during their adventures.
You can start by looking on fanfiction platforms like Archive of Our Own (AO3). It has a large collection of fanfics from various fandoms, including those related to Sung Jin Woo and Woo Jin Chul. Another option is Fanfiction.net, though the tagging system might be a bit different. Additionally, some dedicated fandom forums or groups on social media platforms might also have members sharing their own fanfictions or links to good ones.
Sung Jin - woo in Solo Leveling has the ability to level up, which significantly increases his stats and powers. He can also summon shadow soldiers, which is a very unique and powerful ability. As for Goto from the novel, since we don't know which novel he is from specifically, we can't really compare directly. But if Goto doesn't have the ability to create minions or rapidly increase his power like Sung Jin - woo, that would be a major difference.
The boy could use his hypnotic powers to heal people's traumas. Suppose a person had a bad accident and was haunted by the memories. The boy could hypnotize that person and guide them to face their fears in their subconscious, thus helping them to get over the trauma.
I'm not sure if Woo Young Woo is based on a specific real - person. It could be a fictional character. However, if there is a 'Woo Young Woo True Story', it might be about someone's real - life experiences that inspired the creation of a character with that name, or it could be a misnomer and there is no such true story.
Well, Sung Jin - woo is the protagonist with a really remarkable journey in the 'Solo Leveling' novel. He starts from being a weak hunter and gradually becomes incredibly strong. Goto Ryuji doesn't have the same kind of character arc. Sung Jin - woo has his shadow powers which he can use in very creative ways in battles, while there's no indication that Goto Ryuji has any such distinct or powerful abilities. In terms of their importance in the story, Sung Jin - woo is central, and Goto Ryuji is just a side character with much less impact.