Main Characters Lee Dong Wook 1 main appearances Jo Se Ho 1 main appearances Park Min Woo 1 main appearances Seo Kang Joon 1 main appearances Nana 1 main appearances Jackson Wang 1 main appearances Bae Jong Ok 1 main appearances Sunny 1 main appearances Heo Young Ji 1 main appearances Lee Guk Joo 1 main appearances Ryohei Otani 1 main appearances Joon Park 1 main appearances Park Bom Lee So Ra Song Ga-yeon Shin Sung Woo Hong Soo Hyun Park Chan-yeol