I think first sex (chapter 10) was when he got pregnant
Dayummm I thought they used a condom back then
They did but after awhile
I think hyesung was so sensitive back then too
They didn't use one for the first couple thrusts and woman can get pregnant from precum. You know it yaoi when they say oh look how much your leaking and they show his dick and underwear dirty from precum. It's while the pull out method doesn't work before the dude cums.
@Otaku nerd @Lady Earthly
Ohhh!!!! Thanks for explaining guys!!
SPOILER
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Hyesung is 3 weeks pregnant. ^^