In May 2011, at a Hallyu business seminar held at Stanford University, Lee Soo-man spoke about a strategy of debuting a new boyband, in which they would be divided into 2 subgroups, promoting the same music simultaneously in South Korea and China by performing songs in both Korean and Mandarin.[6] After several changes,[7] in December 2011, the group finalized their name to EXO, taken from the word exoplanet. They are divided into two subgroups, EXO-K ('K' for Korean) for South Korea and EXO-M ('M' for Mandarin) for China. They debuted their first televised performance at SBS's annual Gayo Daejun event on December 29, 2011.