Despite having a secret crush on Chamin, Dowan lets him move into his spare room, and the two become housemates. Until one night, Chamin comes into Dowan's room and wants... to have sex? The problem is, Chamin doesn't remember a thing each morning after. Turns out he has something called sexsomnia?! What is Dowan supposed to do now?

Original Webtoon:
Bomtoon, Lezhin, MrBlue, Ridibooks

Official Translations:
English: Lezhin, Tapas, Manta
Thai: Lezhin* ((1), (2))
Japanese: Beltoon, Lezhin, cmoa, Renta, Mecha Comic, Booklive, Comico, eBookJapanManga Okoku, Honto, Sukima
Others: T.Chinese, Lezhin, French**

Note:
(1) Lezhin TH kept both Boomtoon and Comico TH versions after the platforms merged. The contents are identical.
(2) The official French merged Room to Room with its side story "Room to Love".