ANo. K-ETA (Korea Electronic Travel Authorization) is a travel authorization for foreign nationals who want to enter the Republic of Korea visa-free for a tour, visiti relatives, participate in events or meetings, business, and/or other similar reasons (other than profit-making activities).
Therefore, if you plan to enter and stay in the country for any other purposes such as employment, study, or any profitable activities, you must obtain a visa at the nearest Embassy or Consulate of the Republic of Korea.