Hi. This is what I know: It take 6 hours and a quarter from KUL to Beijing and 1.5-2 hours from Beijing to Harbin by air. The ticket price is about 1500-2000RMB from KUL to Beijing (round trip is much cheaper), 600-100RMB from Beijing to Harbin. The price varies greatly. You should ask for the current price for ticket agent or airlines. It is safe to live and work in Harbin, the problem for you is the weather there. It is very cold in winter, reaching -19C. Flying four times a year yourself saves money I think. Perhaps, cold weather in winter is a big challenge to young children. As to the cost in Harbin, You need over 2000RMB for one month at least including house rental, transportation and simple eating. Hope it helps some.