They don’t actually have sex till the side chapters. They do some things but they are kinda both like traumatized/never given a change to “grow up” so they are both pretty new in that department. And the MC is literally like homophobic towards himself it’s kinda funny. But he thinks way too hard about sex so it keeps delaying it because he keeps almost killing the ML on accident.
To be exact it's on ch 136 when they first kiss so we might reach that point faster but it's not the kind of romantic kiss, it just kinda happen because lsy went into panic attack or something like that. After that J went into denial for like many chapters before they start to really like "date" so yeah just read the novel atp lol besides manhwa left a lot of explanation/details too

I read the novel but honestly I think the translation I found before was just confusing as it has like multiple universe then again I think those are the dungeons but the fragments she sees seem from the future or past.. And sometimes shows something else.. That's why I dropped the novel and just decided to read the manhwa. LoL... Anyways they'll have sex soon