I understand where you're coming from but he didn't fall in love with him as minor so no worries, he's only just realizing his feelings now in the present if he even has any yet and yeonwoons 29 now. I've seen allot of people getting really mean and upset in the comments with other people and I really like the way you stated that so thank you. The author made sure not to bring in any weird pedo shizzz which i think isnt being recognized cuz of all the toxic yaoi we all have read lol and others have been twisting it because of the brilliant way the author does character progression through flashbacks and backstory as we read further along.
Now having said that I truly didn't want him to be a love interest either because I love seo and yeonwoon and I feel it should it stay like how it has been between yeonwoon and loanshark guy. But hey I wouldn't be so obsessed with this if would have been able to predict anything this authors done so far lol.
Pls don't let Mr. Loanshark the 2nd ML. Because based on what I have seen in this past chapter, Mr. Loanshark was caring for Uke platonically like brothers. No need to make the dude fall in love with a minor. It leaves a bad taste. Maybe in another situation, Mr loanshark and Uke met when he is of age then I wouldn't mind the age gap.