Lovers of the Red Sky S01 E13 The Sealing Ceremony

Cheon Gi finishes the portrait. Prince Joohyang asks Ha Ram to find a divine object that’ll help him stay in control even when he gets possessed by the demon. Ha Ram realizes the ring he gave to Cheon Gi is the divine object and gives Prince Joohyang a fake ring. The ritual starts and the demon is released from Ha Ram’s body.