(Photo : Glorious Entertainment) Ji Chang-Wook joins the cast of JBTC's "Knowing Bros," showing his charms as he plays, dances, and performs acrobatics on the show. Together with his co-stars Kim Min-Seok and Ryu Kyung-Soo, the trio introduced themselves as the transfer students from the "Lovestruck in the City" High. As they sat in front, Kim Hee-Chul called them out for sitting before introducing themselves. The trio immediately stood up, drawing laughter from the audience. "Hello, I'm here to heat this frozen winter kingdom," Ji introduced himself, before singing "I'm the handsome Ji Chang Wook," to the tune of Frozen's "Let It Go." Kim Min-Seok and Ryu Kyung-Soo followed suit.