I think Sirang really love Kim Ho but he lied to Kim ho's friend because of some reasons. And maybe Kim Ho's friend has some conflicts with Seunghoon (don't remember his name but he's Sirang's that hates Sirang). I don't know but I think there's something off about Kim Ho's and Sirang's friends like they have something hidden or history about their past relationship.
Now I miss Hyesung and Heesoo stupid fight.. urghh