Wooyoung was like the Sun, sending warmth to everyone present around him. Yeosang though, was just the Moon, who was visible only for the light Wooyoung gave him as a radiance of his sunshine.But then, Yeosang withdraws, tired of being in love with his oblivious best friend and it only takes one push for Wooyoung to realize that Yeosang is the person he loved from the start.
Or,
Wooyoung finally realizes he's in love with his best friend when it's too late and maybe he's already lost him to someone else.