Google hasn't been too keen on acquiring companies in Asia so far, and this is their first acquisition of a Korean company; it is almost certainly a strategic move, because I somehow doubt that Google - who owns Blogger - is in need of a blogging platform from a purely technological point of view. Kim, however, claims that TNC's platform, called Textcube, is technologically very advanced (thanks to VentureBeat for the quotes, as Kim's blog is down at the time of this writing):
"While other blog services seem to be exploring the idea of integrating social networks with blogs only lately, our new blog service Textcube (link in Korean) had already implemented the feature much earlier. Secondly, we have great engineering talents. Many of our software engineers hail from the nation’s leading comp sci programs, such as KAIST."