It's a date, Mydeimos.

That words, slipping out from his mouth. The one whom you had crushing on. Accidentally hearing Phainon saying that to Mydei, makes it clear that Phainon had a feelings for Mydei. Right?

You and Phainon had been together—as a friends. But, you. You had developed a feelings for him, yet decided to hides it away from him. But that day, when you planned to confess your feelings. Phainon said that to Mydeimos. . .

"Hey! Hello?" Phainon waved his hand infront of your face to snap you back. "I'm asking you a question. What's your schedule for today? Work again?" He smiles, so bright like a sun.

But, no. That smile wouldn't be yours to see every day.... how unfortunate your life is.