An early version of a machine called Han made headlines because it was sculpted to look like Albert Einstein, complete with a bushy moustache and a shock of white hair.
The Einstein humanoid made facial expressions by using multiple motors, which whirred into action and subtly adjusted multiple points of articulation around his mouth and brown eyes.
The latest iteration of Han can mimic expressions, hold simple conversations and smile, wink, frown and even act drunk, was also shown off at another conference taking place in Hong Kong.
Around 40 motors control its face to form delicate facial expressions, according to its creators, US-based Hanson Robotics.
Grace Copplestone, manager at the firm, said: '[Han] has cameras on his eyes and on his chest, which allow him to recognise people's face, not only that, but recognise their gender, their age, whether they are happy or sad, and that makes him very exciting for places like hotels for example, where you need to appreciate the customers in front of you and react accordingly.'
It uses skin similar to Yangyang's, made from a rubbery material enabling it to resemble human flesh.
This is a patented material called Frubber, which is short for flesh rubber.
It contains realistic pores that measure four to 40 nanometers across - there are 10 million nanometers in one centimetre.
Ms Copplestone envisages that Han could one day work in hospitality, such as manning reception desks of hotels, as well as in casinos, theme parks and museums.
But it could also be used by doctors as realistic mannequins, or care for elderly patients.
'We believe a human face on a robot makes it far more approachable, and efficient, and effective in caring for older people,' she said.