I got confused more with ren's family relationship chart with wha-ran, who are ren's real ...

Spoiler for anyone who hasn't read further ahead...sooo:
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Wha-ran and Ren are twins. Ren was kicked out of the household because he was the first born son, but is illegitimate (his mother is a concubine to a wealthy man-and she had a son before the first wife, which caused the first wife to be very...upset), so his mother abandoned him when he was MUCH younger, so that she could protect all of them.

Wha-ran remained with her mother, who often beat her (because the mother had problems of her own, and took it out on her kid), while Ren, in the meantime, was rotated through several households that each in turn got rid of him because he was either a.) to strong and cause excess damage, or b.) to attractive, which was causing other issues. He ends up at his adoptive father's Len's household, after a neighbor dumps him onto the recently bankrupt man. Since Len was lonely (his wife had returned to her parents household due to the bankruptcy), he chooses to keep Ren, and later adopts him as his son.

I hope that helps a little bit!

Thanks!! It helps me a lot by saving time to re-read the backstory every update! (●'◡'●)ﾉ

Happy to help! :D