Would a United Korea be able to make rival Japan and China as a regional and possible global powerhouse?

https://www.quora.com/Would-a-United-Korea-be-able-to-make-rival-Japan-and-China-as-a-regional-and-possible-global-powerhouse/answer/%E6%A1%91%E7%94%B0-%E5%81%A5%E5%8F%B8-Kuwata-Kenji?prompt_topic_bio=1

Since President Sung will destroy South Korea ’s economy, it will not be able to compete.