The protagonist, a transmigrator who inhabits the body of the Sect Master's daughter. She is a frail and sickly young mistress who rarely goes out to see people. Her original owner was bedridden year-round with virtually zero social circle. Yu Sui Sui is tasked with becoming Xie Rong Jing's white moonlight by healing his wounds, pleading for him, and taking blows for him. She is described as a kind little white lotus persona, though internally she is lazy and prefers to lie on a lounge chair. She is cautious around Xie Rong Jing due to his reputation as a ruthless villain.
