She actually appeared for a brief moment during the first episode, but she'll be making her official formal debut on the upcoming May 28 episode. The drama staff stated, "She'll be making her first appearance on the show on the 28th. The edited script came out yesterday. Originally. she was supposed to make her first appearance 2 weeks from now, but her appearance got pulled. On the 28th, she'll have one scene, but after that she'll be on the show regularly."
Seungyeon playsChoi Sook Bin in the drama, who was born in a low status but managed to make her son the king through her cunning intellect. She plays the evil-girl role in the drama this time around, so make sure to tune in to see how she performs.