So im confused, Ciel is an original of that isekai that went to Korea then came back to the isekai ?
If you aren't caught up with the last update so far don't read below you will be spoiled up to chapter 30, sort answer to OP; along with EXPLAINING ML POV, warning it a long one
The ML soul did one lop back in time to his own body,
ML POV, he originally a duke from the isekai world and he travelled to Korea with the promise of having an argument for more guides come to his world with the "saintess" who was a guide from Korea that got the ability to travel between the two worlds but he was tricked to be used by "saintess" and now his world's hope was destroyed, then he met the MC who unlike the "saintess" matches him perfectly but he was weary of her believing she was part of the scheme to tie up him to the people from the Morden world who tricked, however he realised that the MC was clueless about his origin and situation and actually look at him with love and he grew to love her but he didn't do much to fix his cold attitude and experience his love and only thought to work harder to make a future for them witch made MC be more neglected emotionally by him, and after the death of him and the MC their soul went back in time to his original world with him having his memories of the "future" in his original body before the appearance of the "saintess", while MC went to a new body without knowing she not only travelled to another world but also travelled to the ML past, and later when he finds out the MC is actually in his world now he was overjoyed and all the affection he failed to express in the past along with the trauma of her death came pouring out making him more crazy about her and more expressive of his jealousy and obsession seeking to have her once again and be more pressing of her to come to him as in his eyes they are still a couple and should be together (no apologies just: honey glad to see you again lets have a redo and be lovely dovey now)
Damn ! This is hot