Till the End of the Moon

Yandere demon lord born of darkness x righteous phoenix saint born of light, in a tragic romance that spans centuries.

Tan Taijin is a man who has never cried. Even when his eyes were cut out and his limbs torn, he never weakened or wavered. Until that one unforgettable day, the witnesses recall, when they saw him beg pitifully and cry tears of blood, dripping down.

(Source: Kuaikan, translated)