Responses
I remember when the brother was drinking with a friend in a bar, he said something like "Why men are attracted to older women?, they are bossy" and the friend replied "Because that's the best part, it's hot". I feel the foreshadowing started there, that Taehee would feel attracted to Haesoo because she's kind of bossy ad alluring.

I can kind of see where the plot is going, Taehee’s gonna become infatuated with Haesoo without realizing it which is gonna cause him to try to ruin Taeha’s relationship even more with her due to this factor but he won’t understand why he’s trying so hard to ruin the relationship until he realizes he’s become obsessed with something he can’t have.
Taeha’s gonna tell that girl ‘no’ he’s not seeing anyone because Haesoo made him promise to not tell anyone they were dating even when asked so I can see him saying no. She honestly should have taken the hint when he said a 34 year old woman was his type but I guess she’s too blind to see that .
Anyways. I’m excited to see how far the author is gonna take this drama arc. Hopefully we get a time skip arc after they separate because their will be a separation arc I just don’t know how soon that is