My Complex Soulmate!
OTHER NAMES: Unmei no Aite ga Yayakoshii; 運命の相手がややこしい！; 운명의 상대는 이상야릇해!
Author: Yu Yuzuki
"We could just go to the hotel now, right?" Hiroto went and signed up with a dating agency when he was heartbroken, and the match he ended up with was a much younger, very cute girl! Their compatibility turns out to be 200%! They get along fine when she invites him to go to a hotel, and their bodies end up being a perfect match as well. Hiroto is overjoyed! However, when he meets up with her again, the person before him turns out to be a pretty boy who claims to have the same name! This manga has boys-love and teens-love elements in it.
English
https://manhuascan.com/manga-unmei-no-aite-ga-yayakoshii.html
https://manhuascan.com/manga-my-complex-soulmate.html
https://www.ebookrenta.com/renta/sc/frm/item/140416/
Korean
https://manamoa46.net/bbs/page.php?hid=manga_detail&manga_id=14884