Based on webcomic "Island" written by Yoon In-Wan & illustrated by Yang Kyung-Il (published from May 11, 2016 to February 15, 2018 via Naver).
Island is a Korean YLAB webtoon and the 7th superstring webtoon. Published by YLAB, created by Inwan Youn and illustrated by Kyungil Yang. Part 1 was originally a Korean manga in 1997 but was rebooted on May 2016 as a webtoon and Part 2 was released on November 2016.
Seo Yea-Ji was first offered the lead female role, but declined.