By shedding light on the concept of the fangnu (mortgage slave), this paper explains why young men from China migrate to Ethiopia. Young, educated, employed and ambitious, the fangnu is a modern type of slave who is said to have sold his freedom to the bank for the purpose of buying a house. For young men coming from a rural background, temporary migration offers a chance to earn the money so badly needed for a down payment or repayments on mortgage loans for their newly bought residential property. I argue that the fangnu is the child of a Chinese society characterized by high social mobility as well as a growing demographic imbalance owing to the one-child policy. In this context, a house – or in urban China, commonly an apartment in a high-rise building – is increasingly seen as a marker of status, especially in the marriage market. Although the Chinese do not demand a bride price, the hunfang (marriage house) has become the norm in urban Chinese society. Unable to rely on the financial support of their kin, young Chinese men from the countryside migrate to earn the starting capital needed to cope with the socio-economic pressures of settling in the city.