Shen Twin AU: Part of Shen Jiu's backstory is that his brother Shen Yuan was killed before he escaped. YQY is the only one that knows SY existed because SJ won't walk about him. SY (The Reader) is mad at the wasted potential and when he transmigrates into the novel, he is put in as SY, SJ's younger brother. People find him and notice his resemblance to SJ. The rumors reach SJ and he goes to investigate. That's when the system kicks in and tells him his role. SJ becomes protective of SY.
ohhhh so this time, SY knows of SJ’s story beforehand!! aaaand im guessing this is before LBH even arrives in CQP so eyyyy more time for twins bonding and maybe SY dragging SJ out of his barbed shell full of hate ldslfsdkjfskjdfs CONSIDER - typical internal sassy SY salting his twin bc “gdi ge you’d have been sent to a rehab center in the modern world already w/ that attitude”