Under the Blue Moonlight

Haram and Hanul are a pair of brother and sister and they treasure each other a lot. They rely on each other since they're Yin, a being that is looked down upon in society for the ability to give birth to the superior Yang and blur the lines between genders. One day, Hanul makes a promise to Haram that he will come back, but 6 months have passed and he is nowhere to be found. That's why Haram decides to go find him with the help of a Yang named Chong Yun. Under the Blue Moonlight