HTCB is one of the few collaboration dramas between Japan, Taiwan and Korea. It is a Live Action drama/ adaptation from a manga of the same title (there goes your Japan part), and the actors are mainly Taiwanese except for the female lead Park Shin Hye a Korean.
I am an avid manga reader and a drama addict so this is soo ME!
Title: 旋風管家 / Xuan Feng Guan Jia
English title: Hayate the Combat Butler
Genre: Romance, comedy
Broadcast network: FTV
Broadcast period: 2011-Jun-19 to 2011-???-??
Air time: Sunday 21:40
Opening theme song: Bie Wen Wo (別問我) by William Wei (韋禮安)
George Hu plays a man who is buried by his parents' gambling debts. With no way to pay back the money, he thought about going to the dark side by getting into the kidnap and ransom business. But instead of becoming a kidnapper, he ended up saving a girl from a real kidnapping. The girl turned out to be the sole heir of a conglomerate who faced these kinds of threats every day. In a case of kidnapping gone wrong vs. mistaken love confession, she hires him to be her butler and helps repay his parents' debts. Grateful to have gangster collectors off his back, he vows to protect her from harms, which is no easy task.
George Hu as Ling Qi Sa 凌奇颯 (Hayate)
Park Shin Hye as Xiao Zhi 小芷
Tia Li as Maria 瑪莉亞
Li Yi Jin (李依瑾) as Gui Chu Ju 桂雛菊
Source Drama Wiki