I think you have the wrong idea. The Frozen Throne is a
RTS (real time strategy) game, similar to
C&C, Age of the Empires etc. These games can be played on PCs
with or without internet connection.
World of Warcraft is a MMORPG (Massive
Multiplayer Online Role Playing Game). You need internet connection
and a Blizzard account. After purchasing the game, you need to buy
playtime. Its about S$40+ for 60 days. After 60 days your account
will be frozen till you top up again.