Ok there were multiple stories in this one story but one of them was like this one dude caught his brother having sex with someone and he saw the tattoo of that person and his friend he has a crush on had the same tattoo so he got sad about it but it turns out that it was someone else with the same tattoo because they knew each other or something and they got together in the end though
I think the chapter 5 of this manga. http://www.mangago.zone/read-manga/first_come_first_served/.
What even.l.
same thought༎‿༎