During the fight with the demon, a ring suddenly appeared and release huge energy to defeat the demon. After healed by Grandpa Ginkgo, Prince of Ye found out he can saw the monster now.
This is Sesame. He was the 
Serenity Pavilion troublemaker.
وهذا سمسم. كان المُشاغب في صيوان الصّفاء
Das ist Sesam. Er ist der Poltergeist
aus dem Pavillon der Stille.
Ella es Sésamo.
Vive en el Pabellón de la Serenidad.
Voici Sésame,
c’est elle qui hantait le pavillon !
Questo è Sesamo.
 Era lui il combinaguai del Padiglione della Serenità.
Este é Gergelim.
Его зовут Сезам. 
Он бедокурил во Флигеле покоя.