TBS is a major national broadcasting station in Japan. It’s Japan’s equivalent of Korea’s KBS, SBS or MBC. It’s quite an accomplishment for a Korean drama to be aired on a major network as most end up in cable channels.
Previously in November 2011, Japan’s cable channels DATV and KNTV both began broadcasting Protect the Boss simultaneously which is already an exceptional feat. TBS would be the third Japanese network to air this drama.