Hi, if we are a group of 5 persons coming from HK airport going to Langham Hotel in Mongkok area, what shuttle bus should we take?

You must refer to Langham Place Hotel Mongkok, don' you? Well, shuttle bus no. E21 or A21 helps. By E21, you need to get off at Mong Kok Market, Argyle Street and walk to the destination then. It costs 17HKD per person.

By A21, you need to get off at Bank Centre, Nathan Road and walk to your hotel then. The bus fare is 33HKD per person.

As I know, the taxi fare for the journey should be 230HKD or around. So you can weigh which means you use.