
Um, it's most likely because the second love interest will never get a chance to have sex with the MC in the first place. I don't know if you've noticed, but unless the MC is introduced as slutty or has already slept around, then they won't have more than one sex partner. If they are a virgin then they will only ever sleep with the one who is meant to be end game. As for the second male lead, the MC made it clear that he never liked his childhood friend like that in the first place. So even if he never slept with the Seojun, it's not like he was going to get with his childhood best friend anyway. The guy been friend zoned a long time ago and the MC was probably praying he never confessed. It's like those girls who are friend with guys and then they make everything weird by trying to come onto them so they gotta end the friendship.
And I don’t know if it’s just me but why is it always when there are two love interest that the one who had sex first with the MC is automatically he end game?! Just because the childhood friend waited and is such a nice guy he’s the loser because he wasn’t fast enough to had sex with the MC? lol don’t know if it’s just m