Sung Kei Li is now a PhD candidate in HKU, and soon to be a Croucher fellow in the Instituto de Física de Cantabria in Spain. His research interest lies primarily upon gravitational lensing, in particular, extremely magnified stars in distant galaxies. Sung Kei investigates how to use these stars as a pioneering probe into the nature of dark matter, as well as the star formation physics beyond our local universe.