Born in New York City to a pixiu mother, Song Linyu, and huyao father, Yu Leming
Far from the charming suitor he had been, Leming was violent and demanding as a husband and a father, an incurable gambler who leveraged his wife's abilities by feeding her large quantities of gold and jewels to accelerate his earnings, becoming abusive at any sign of resistance
When Rain was two, his mother repudiated her pledge to his father, which left her greatly weakened, and ran away with him
They moved around frequently for the next year or so before settling in Chicago
Despite having a pixiu's naturally strong constitution, Linyu was often ill due to the repudiation and not having treasure to eat to offset it, in addition to working long hours, and they struggled to get by; she did not tell Rain about his supernatural family heritage in hopes of him never experiencing what she had
His father tracked them down when Rain was six; sensing his approaching presence but not having enough time to run, his mother hid Rain in a magically concealed closet with strict instructions not to come out or make a sound no matter what he saw
When Linyu would not renew her pledge of loyalty to him, nor reveal Rain's location, Leming killed her and ate her heart
Rain was later found by neighbors, crying next to his mother's body and covered in blood; the police did not put much stock in his statement since he insisted “the tiger man did it”.
With no next of kin on record, Rain was put into the child welfare system, and spent the next few months at a group home in an intensive therapy program that he would continue to participate in until he was nine
He was then placed with foster parents Anthony and Eleanor Kim, alongside Lucas Sin and Jasper Yong
Small for his age, and unused to having siblings, Rain was initially withdrawn and easily frightened but slowly came out of his shell over the next year
Became something of a clingy crybaby, greedy for the attention and affection of his new family
Unfortunately, Eleanor was diagnosed with cancer when Rain was ten and the children were removed from the home
He spent the next several years bouncing between different group and foster homes but became wary of getting too attached to anyone, despite his need for closeness
Leming retrieved him when Rain was sixteen and his pixiu abilities began manifesting, despite Rain's vehement opposition to the arrangement
Back in New York, his father attempted to coerce Rain into giving his pledge of loyalty to him; when various methods of punitive physical 'persuasion' failed, Rain was locked in a windowless room and told he was to remain there until he changed his mind
After multiple suicide attempts, Leming placed magical bonds preventing self-harm on Rain in addition to his physical confinement. When Rain stopped eating, his father simply force fed him. Throughout, he continued to use violence to try to get what he wanted
With mounting debt and Rain's continued insistence that he would rather die than pledge loyalty to him, Leming ultimately sold Rain to the Hellfire Club to avoid bondage himself when Rain was nineteen
He was not on the market for long before he was acquired by Mizukami Hana and Wang Zhanyuan ( also known as Jon Wang) for their Wuxing project, a magically bound collection of five individuals, each corresponding to a Wuxing element, for their sexual use
Initially, Rain was quite defiant despite the magical punishment, inured to suffering after years of abuse at the hands of his father, but this has been worn down into nihilistic acceptance of his circumstances over the years
When Hana first demanded his pledge, he refused, and continued to refuse for the first couple years of his bondage, but was eventually coerced into giving it to her after she began threatening other Wuxing members rather than Rain himself
Currently, Rain feels hopeless about his situation and the only thing that really matters to him is the well-being of those he cares about, namely his fellow Wuxing members