Responses
(SPOILER)
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They didn't do it, yoontae held back (he did a little sniff and some touching) + jeongseo said something like "i don't wanna have a kid", he called a driver and sent him home. Being alwas near dominant alpha (yoontae) triggered jeongseo's heat eventho he's recessive.
(ANOTHER SPOILER)
after that iirc sumin confessed to jeongseo. Shortly after winter came the big reveal happened (no drama iirc it deepen their relationship). They'll do it sometimes after reveal.
They are not doing it right even though I'm desperate to see them making out but they're underage for that ༎‿༎