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Legoland Korea's construction is currently 24% complete with plans to open in July 2021.
Source: http://news.tvchosun.com/site/data/html_dir/2020/07/06/2020070690038.html
The park is now aiming to open in July 2021
Sources: https://www.yna.co.kr/search/index?query=%EB%A0%88%EA%B3%A0%EB%9E%9C%EB%93%9C&ctype=P&from=20200521&to=20200521&period=0d and https://www.fnnews.com/news/202005210923575600 and https://nocutnews.co.kr/news/5347413 and https://www.facebook.com/dongtuni/posts/3073975946027685
It looks like theming samples have arrived onsite:
Sources: https://www.facebook.com/koanner/posts/3725858650821703 and https://www.facebook.com/permalink.php?story_fbid=2638219049789407&id=100008040136445
Drone footage of the park at 8 seconds and 56 seconds:
Source: http://www.mstoday.co.kr/news/articleView.html?idxno=32075