So my theory, Taejoo already knows. Why? Cuz
1) Heewon has significantly longer hair than Heekyung
2) Heekyung behaviour
3) Heewon already mentioned something related to Taejoo earlier when he was telling Heekyung why he got late.... So Taejoo must have known that Heewon will out all night tonight, so he purposely left his jacket, so that he could come back when Heekyung is all alone
He must be deliberately mentioning about Heekyung not getting wet to not get suspicious
She/ Her 20yo
Bi(?) (figuring out😭)
My favourite u ask? 😔
It's obviously "Pizza Delivery Guy and The Gold Palace" "Lost in The Cloud" and "Happy Twogether" 😔