*both are from the same writer Mo Xiang Tong Xiu
*both are a wuxia
*low key BL (the original 'novel' its a danmei)
*cultivation
*one of the ML everyone see as a danger and evil: practice demonic cultivation (the untamed/Mo Dao Zu Shi); a demon king (Heaven Official blessing/Tian Guan Ci Fu)
*immortals