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Basically, at first, Hyehan just wanted to play with Charin because Charin has big breasts just like a woman. But as time went by and the more he had sex with Charin and got to know him during their cohabitation, he started to develop feelings. You can see it from the way he reacted when Charin smiled at him or teased him in a 'flirty' way. HE BLUSHED!!! But he kept insisting 'I still like woman!!' and then, when they had done all the deeds, he even bathed him, literally taking care of him like a princess lol
And when Charin nearly died in chapter 20 because of Pentatonic, he rushed to save his life and successfully extends his life in chap 21 but then finds out they are having a baby.. It doesn't seem he is happy about it to the point he even says that Charin is uncivilized and Hyehan doesn't share his genetics with just anyone, implying that Charin doesn't deserve to get a child from his genetics... But again, Hyehan only says this because Charin says it doesn't matter if they are having a baby or not because he is dying in two months or something and he looks like he is disgusted about having Hyehan's child..
Spoiler
There are others that can get pregnant but it is still rare, I think... And Garon (the black haired guy) can make anyone pregnant, it doesn't matter if they don't have the same ability as Charin.
Based on chapter 21, it seems like there are two types of evolved humans:
1) can get others pregnant (I think this one meant for Garon)
2) can get pregnant (like Charin)
yeah, I understood why you might be confused with the timeline with all of these flashback but no worries once this reach chapter 21, you will not be too confused anymore.. and idk why people keep misunderstood that Charin is dead... The panel where Jin saw Charin laying on the bed as if he was dead, that was just Charin being high.. it's obvious with the pentatonic. Based on my understanding, they cannot die because of overdosed but they will die because of the demon that will rip out of their body (pentatonic effect)...
Hyehan is actually horrible still he literally helped kill all of Charin's friends + charin by getting them addicted and made charin into a sex slave like that dude brought them to hell he better doing some heavy groveling to make up for being literally the devil incarnate even if he's started liking charin
But then we also have to admit that Charin was the one who dragged his friends into this. Jin had warned him not to trust Hyehan, but Charin still insisted because of his disdain towards their situation.
He never forced Charin to accept his terms. It was Charin all along who was the problem. But still, of course, Hyehan isn't a good person. He never claim to be even in the latest chapter.. he is quite honest from the start until the end about his character. That is why Jin dislikes him and he doesn't understand why Charin accepted his terms.
charin is my fav character so seeing all this shit happen to him is making me so him and jin are more like brothers to me (can’t rlly see them together) and the green haired guy (that i shipped w charin) is only using charin for his own needs like ughhhh