Kim Sun Oo is a South Korean trainee under BELIF+, who trained for ten months before entering Big Hit Labels X Mnet’s survival/idol show, I-land on June 1, 2020. His strong and bright facial expressions soon captured people’s attention earning him the nickname, ‘Happy Virus’ in episode six and winning the Seventeen mini-mission challenges in episode ten. A fan favorite (his followers refer to themselves as Sunshine), he was ranked first in global voting reported in episodes seven, nine, and ten. In the final episode, he was ranked eighth by global viewers, but the producers chose him to be the seventh and final member of ENHYPEN.
(Sources: kstarlive.com, kpopfandom.com, I-land)