Is it just me who thinks that there is possible incest between the main female leads' family characters?

Because the Geumhwa company was founded by Seon Ju Cheol who in the flash in the history part was portrayed by Lee Ji Hoon aka the soldier. Then at some point, they showed the prophet of the soldier portrayed by Kim Hee Jung and her twins who are the grandmother of the FL and the grandmother's sister (character Eun Ok Jin).

Am I getting too far-fetched with my brain saying to me that the father of FL (Seon Sam Joong) and the mother of FL (Mi Soo) are both related? Seon Sam Joong being the son of Seon Ju Cheol and MI Soo would then be the grandchild of Seon Ju Cheol which would make FL both grandchild and great-grandchild of Seon Ju Cheol?