The Taiwan eSports League (TeSL) is a televized league featuring three games: Kart Rider (Racing), Special Forces (Team-based FPS) and StarCraft II. It is probably more popular than other people think it is. Gama Bears have 80,000 fans on Facebook. Wayi Spider have 90,000. Pretty significant considering a team such as Evil Geniuses have half that amount. Players live in team houses, and teams often have corporate sponsors, giving a very healthy impression of the Taiwanese eSport scene.
TeSL has an exchange programme in place, whereby teams are allowed to bring in foreign players to play for them for a set amount of time. In the past, Wayi Spider had brought in MVP's Galaxy to play for them, whilst Thermaltake Apollos had Prime's ByuN.
As clarified through his tweet, SaSe will be staying in the Gamania team house for three weeks, whereby he will have the opportunity to play five televized matches.
Gama Bears roster:
Luway (Female player, not listed on the league website, so I'm not sure if she's a pro)