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I think Jin might end up being a top, but he's not the only main character. The 4 people on the cover are the main characters, and will have their own season focusing on them. This is the first season which focused on Jin. So if Jin turns out to be a top, you have three other main characters who are possible bottoms.
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Actually, thats a very good point that I'm not sure about, I got the information from MTL-ing(Machine Translating) the Epilogue episode off the Korean L3zhin site, so I don't know how accurate my info is.
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What I've gathered is: Jin, Kimoto, Garon and Tehir are the main characters, and that this manhwa will be split into 4 parts. Each part will have a character's individual story that the author wants to use to convey an overarching theme/message for their manhwa. This season is the first part and is labelled 'Jin's Story' and the next seasons will be another part that'll focus on telling another character's story.
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So I don't really know about an endgame MC. Again this info could be wrong, so if you would like to verify this information for yourself, I got it from the: 'Epilogue Episode' of '햇님반유치원동기' on the Korean L3zhin site.
read a few chapters a while ago and liked the story but wanted to let it simmer, came back to it now but saw album shots of Jin and captain(?) (can't remember names) but is Jin... not a bottom? is he a switch?
idm spoilers, I just wanna know cause I prefer bottom MCs and I liked Jin that way, so idk if its worth picking up if he's a switch or a top