https://www.wuxiaworld.com/novel/tomb-raider-king
There you go onii chan ヾ(❀╹◡╹)ノ~
She is a researcher on relics. Actually Joo Heon already knows where his twin sister is and asks Edward to monitor and get in touch with his sister, because in his previous life she had a relic disease (forgot the term) and when Joo Heon want to met her, he was too late because her illness was already severe.
Unlike Joo Heon who has dominance 100 and affinity 0, his twin sister has the opposite, which is affinity 100 and dominance 0. In the novel it state affinity but i remember in the manhwa its called sociability.
They both monster i guess lol ╮( ̄▽ ̄)╭
So i just read the novel in chapter 278,
And.....
!!SPOILER!!
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SEO JOO HEON HAS A FUCKIN TWIN SISTER LOL
First president kwon has a sworn brother, julian's sister still alive and then this xD
Welp not gonna surprise anymore ╮( ̄▽ ̄)╭