In Lezhin, this manga is in BL category so it's really a yaoi or a shounen ai.
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Thank you for the reply! Btw mind linking me to the lezhin versions of this! I wanna buy some chapters
Just go on google, search up "Lezhin". Then when you get to the website, just search for this manga
on lezhin it might be title "My Starry Sky" instead of "Cosmic Boy"
Yep i forgot to say it but the illustration is the same as here and the English scans in mangago is at the same level as those on lezhin (English scans) but if you want to be spoiled you can visit the Korean version of lezhin where there are more scans.
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Is this a yaoi or shounen ai ?? Or neither?? Because its just classified as a drama / school life