Listen to Shouldn't You Know When Someone Is Pretending online. Shouldn't You Know When Someone Is Pretending is an English language song and is sung by Sonya Belousova, Giona Ostinelli and Lindsay Deutsch. Shouldn't You Know When Someone Is Pretending, from the album The Witcher (Music from the Netflix Original Series), was released in the year 2020. The duration of the song is 2:21. Download English songs online from JioSaavn.