Han Jisung - Minsungs

Lee Minho and Han Jisung had been living together in the dorm for three years now, and every damn month, Jisung would lock himself in his room, not even going out for a drink when Minho was there. And it was annoying.
Minho often noticed small patches of reptilian scales on Jisung's body, but the owner of them said they were tattoos. They were too realistic to be tattoos. But he definitely has one real one on the right side of his chest.
Now Minho began to notice more and more often in the darkness sparkling, attentive, yellowish eyes with vertical pupils...

Han Jisung wasn't quite human. Once a month, for exactly a week, like a curse, he resembled a reptile. The rest of the time, he looked normal. When the time for his transformation approached, bits of snake scales would break out from his body, and his eyes, especially at night, would glow yellow in the darkness. He wasn't completely snake-like, but his entire body, save for his head, palms, and soles, would be completely covered in scales, and his eyes would become completely reptilian. He also felt terribly, terribly cold during this period. And lonely. It was as if he longed for love, but who would settle for such a reptilian man?

Minho was just his neighbor who didn't know anything about Jisung's peculiarity.