The series was promoted heavily by MBC, with the first teaser released six months before its premiere at the MBC Drama Awards, where leads Yoo and Kim also served as presenters.
Ruler dipromosikan secara masif oleh MBC, dengan teaser pertama dirilis enam bulan sebelum pemutaran perdana di MBC Drama Awards, di mana lead Yoo dan Kim juga berperan sebagai presenter.