they're not married, they just said that he is a brother in law that got married into the tower so that he could be present in that meeting with the asshole blond guy but he never got married to anyone
ohh ok but wait im not sure if this is really a spoiler so ill put a warning
SPOILER!!!
in his wiki page his wife is the qingcheng girl and her only no one else (so if any of u think it s aharem its not)
Pretty sure they got married by kowtowing together in front of the family guardian. Isn't that why she took off her veil, told him to stop calling her sister, and went to "introduce him" at her families grave site.
i kinda feel bad cause like hes still song yu right and the qingchecng i think that was her name yeah that girl doesn't know and now they got married?!?!? without him knowing to omg that's so wrong