On November 11, 2012, Yesung along with his brother Kim Jong-jin officially opened their cafe "Mouse Rabbit Coffee" after their franchise, "Babtols" and "Handel & Gretel".
Tanggal 11 November 2012, Yesung dan adiknya Kim Jong Jin secara resmi membuka kafe mereka dengan nama "Mouse Rabbit Coffee" setelah franchise mereka, "Babtols" dan "Handel & Gretel".