Singer Navi revealed her talents and talking skills in the latest episode of "Quiz that Changes the World". She explained her nickname 'fierce voice' by saying, "I went to sing at an event and I happened to sing louder than usual during the high notes. As a result the speakers exploded". The singer went on to demonstrate her powerful vocals by singing her title song 'HELLO'. Navi also gained high praises from the cast by showing off her ability to express sad emotions. She played the keyboard and sang the children songs, 'Mountain Rabbit' and 'Baby Dinosaur Dooli" in an especially sad way. Actor Jo Hyung Ki even cried during her performance. Because of her unique talents and powerful vocal skills, all of the cast, including the MCs, applauded her greatly. Source: Sports Today via Nate