Jin-Seong has always had a crush on his next door neighbor, Yu-Ra, ever since they were kids. Due to unforeseen circumstances, they had to move in together and they practically became brothers. Jin-Seong eventually gave up the thought of ever becoming Yu-Ra’s lover because Yu-Ra would draw a line in the sand each time he tried to reveal his feelings. But one night, Yu-Ra’s behavior begins to change. He seems to be turning into a different person in the evening...someone with an insatiable lust for the physical… Jin-Seong has to admit, a side of him does enjoy his feelings being reciprocated, but this feels wrong and unsustainable. What’s gotten into Yu-Ra and is there something more sinister at play…?

(Source: Lezhin US, edited)

Note: Chapter count includes 25 side story episodes.