Yoo Joonghyuk is the main character of tls123's novel Three Ways to Survive in a Ruined World. Throughout Omniscient Reader's Viewpoint, he is mainly seen in his 3rd and 1863rd regressions.

Yoo Joonghyuk is repeatedly described as extremely handsome by various individuals, including the author of Ways of Survival and Kim Dokja. The latter even uses him as a measurement for others' handsomeness on multiple occasions.

Yoo Joonghyuk has wide black eyes with thin double eyelids and thick eyebrows.