Idk why but there was a chapter insinuating that it could possibly have been Dojins brother that yuri was missing
Now that is a theory, after seeing your comment man thoughts came to mind!! Imagine what if the picture that their friend mentioned was actually dojun because of their hair colors???
https://www.mangago.me/read-manga/end_of_line_of_sight_30_degrees/uu/nhs_chapter-1392999/pg-1/
Specidfically in this chapter, maybe it was because the pages were a bit out of order, but I sensed something
NGL I love the ending but there's so many holes first of all, WHO DID YURI MISSED!?! Maybe it could be Dojin cause ofc, they are the bestest friends. And I wanted to see more of Dojin's big bro, plus Yeonwoo's parents finding out their relationship. And their wedding too!!! I really dislike Dojin's big bro's friend, like selling the ring without permission and didn't even shared the amount he gained from selling Dojin's design?! They both made it and it's not fair he was the only one gaining from it. I really hoped Dojin's big bro dropped that guy. I really realllyyyy love this story and I wished there would be side chapters