Do-kwon has a secret: he has a huge weakness for pretty faces. One look at the face of a pretty boy gets him internally screaming. And lo and behold, Ryeo-soo is one of the prettiest boys he’s ever seen in real life. Do-kwon is busy mentally drooling over him every time they interact. Man, it’s a good thing nobody can hear his silent fanboying, right? Except, Ryeo-soo has a secret, too. He can hear other people’s thoughts. And he’s really having a blast listening to Do-kwon’s. In fact, there’s something else he wants to hear from Do-kwon… 651t72

Original Webtoon:
Bomtoon, Lezhin

Official Translations:
English (R15): Lezhin, Tappytoon
Japanese: Beltoon (R19), Lezhin (Main Story), Lezhin (Side Story - R19)
Thai (R19): Boomtoon, Lezhin
Others (R19): T.Chinese, Spanish

The main story is R15 while the side stories are R19. Bomtoon has the R15 and R19 combine and if your is verified you can access the R19 of the side story, if not you only be able view the R15 ver.
Lezhin US only released the R15 version of the side stories.