• Xu Ji, 38 years old—partner of an architectural firm, stepmother's brother-in-law, and "step-uncle" in name only.
• Jiang Ke is 24 years old - the "niece" brought by Xu Ji's brother after his remarriage, suffering from post-traumatic aphasia.
Jiang Ke was kidnapped when he was 18 years old and developed a strong fear of male physical contact. The only person who can let her down is her "brother-in-law" who is 14 years older than her but has no blood relationship with her.
Three years later, Jiang Ke returned to Xu's old house after graduating from college. Old trauma was triggered during a thunderstorm night; Xu Ji became her only "safe island".
