Helian Yao Kai is the fourth son of the Helian family, head of the Interstellar Prison and a top detective known as the Cold-Faced Detective. He is the first to bring Niuniu to the family mansion after receiving his sister’s final call. Despite his usual stern demeanor, he shows exceptional tenderness to Niuniu, braiding her hair and carrying her with care. He is deeply loyal to his sister’s memory and ensures Niuniu is accepted by the family, even facing potential punishment from his mother.
