What Hyeondo reached the end, kissing it, had meaning. Because the protagonist didn't have the value of breaking ties with Hyeondo from the beginning, so he continued saying "oh, because now we're friends" or "amigos esto y amigos aquello", even though it was clear that Hyeondo was sorry for him. But for some reason, the protagonist still wanted to maintain appearances, while with Taeyeon, he was firm in deciding that he liked it, and their relationship was very mature, even though Taeyeon wanted to control the protagonist completely. As Hyeondo says, "I will finish with this for you", which leads me to believe that the end will be this "friendship" between them.
I don't know what to say, I don't have money for therapy so I read yaoi.