The so-called S-level teams were actually a term coined by player communities, mainly stemming from rating agencies on forums. In these forums, there were all sorts of player organizations, some of which specialized in assessing the strength of teams.
For instance, regarding instance groups, they would determine the strength of a team based on various indicators such as progress in the Tower of Pantheons, clear time, casualty rate, leaderboard data, and so on. There were five levels in total, with D-level being the weakest and S-level the top-level. Renowned teams like the Yanhuang Legion, Angel Legion, and Heavenly Group, were all S-level teams. Huang Yi aimed for this level.
Within half a year, turning all three major teams into S-level teams in their respective fields was a tall order. However, Huang Yi had this confidence in Knight, Sunset, and Overlord, these three individuals.