
Let me rewrite the end. Shinobu forgives kou in the end, they don't get together cause shinobu doesnt love him the same anymore. Once that trust is broken it can never be mended. Then shinobu meets a new guy at his new company
The guy is pretty cold and strict but caring and loyal. New guy ends up falling in love with shinobu while kou tries to make advances at shinobu. It's too late though cause shinobu ends up falling for new guy and they get together while kou cries and says that the next time he falls in love he won't be such a cheating shit. The end.
Is this the, "best friend likes you but doesn't wanna ruin the relationship so he dates other girls" plot or the "best friend is straight but cares about you" plot? I hope it's the second cause that hyung is WOW! Is he a mafia boss? A gang leader? Something completely harmless like he owns a flower shop? Idk but I'm interested in him