Ehhh how do you know?? Did you read the raws??
Context clues
So it's a guess? But that's possible
in the last panel of the previous episode the childhood friend said “ so he likes guys too” meaning that the childhood friend likes guys and he was clearly bugged at the fact that the mc had hickeys on his neck plus its the way he was acting towards the mc that made it clear he likes the mc but we will see w the upcoming episodes
i just know the mc childhood friend is gonna get between them specially since he jinxed it