Project Learnt is a social enterprise striving for the growth of social mobility of the underprivileged teenagers and the sustainable development of the surplus teachers in Hong Kong. We make use of the idle time of a restaurant to run a co-learning space for students who are in need of self-study places or academic support. Also, some of them would be hired as the restaurant staff to earn a living. Meanwhile, the surplus/pre-service teachers or private tutors are invited to provide on-site tuition to the students at the restaurants, so that they can enjoy the food and a comfortable learning environment and thus facilitate the learning and teaching of each other.