
Okay I'm just going off of pictures because I hardly know a lick of korean.
1. here is a link to raws for anyone who want to go see it for yourself
https://tkor.ltd/19%EC%84%B8%EA%B8%B0%EB%A7%90-%EB%B9%84%EB%A7%9D%EB%A1%9D
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Okay for spoilers
1. He is not her biobro. Her real brother is the brown haired boy
2.When they were kids their mother tried to kill her which is why she has big time trauma.
3. Real biobro I think couldn't handle things and eventually commits suicide...I think
4. She ends up with blond boy
This is all I can spoil because I'm just going off of pictures
PS: have no idea why dude is being creepy and cryptic ╮( ̄▽ ̄)╭

spoiler
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farm boy only sees lillian as a little sister because he was basically her substitute brother throughout her childhood. Plus he still mourns the death of his wife emily. The biological brother (the boy who was adopted into the marquis family) is actually gay and held feelings for elliot (the golden haired serial killer esc "brother")
Plzz im so lost