It's been revealed that singer Kim Jo Han, the newest addition to MBC's 'I Am a Singer', has acted as a vocal trainer for many popular idols in the past. His long list of trainees include:�SNSD's Taeyeon and Jessica, 2AM, 2PM, T-ara's Soyeon, miss A's Fei, Super Junior's Ryeowook, Sungmin, Yesung, Kyuhyun, KARA's Nicole, SISTAR's Hyorin, and SECRET's Ji Eun. Kim Jo Han's agency explained, "Agencies ask Kim Jo Han to act as the vocal trainer for many idols not only because of his talent in music, but also because his warm and honest personality as well as his modesty help the young singers build an upright character." They added, "Because so many of the idols he has trained are making appearances on KBS's 'Immortal Song 2', he often has a hard time deciding who to root for." Source + Photo: Star News via Nate, Joy News via Daum