
I'm a fan of the novel and I loved the sex scene.
I really don't think it was weird or unnecessary, be for real guys, is chapter 63. Also this part in the novel is just they planning for the great dungeon, so I understand that, to midia as a bl manhwa, was needed "something more" in a arc that's mostly nothing happens.
Also, manhwa still is slow burn, thoses are just dreams/the future