Synopsis: Under the Blue Moonlight

Haram and Hanul are siblings who solely depend on each other as they are both Yin, a gender-blurring entity that society shuns despite being the only ones who can give birth to the sacred Yang. Hanul abruptly departs, assuring Haram of a speedy return. However, as time passes without any communication, Haram ventures out to locate Hanul. Surprisingly, a Yang called Chong Yun lends Haram a hand during the search. The story is originally a webtoon, and official translations are available.