| Lin Wen |
|Family|| Joan Watson (half sister)|
Oren Watson (half brother]]
|Behind the scenes|
|Portrayed by||Samantha Quan|
Lin Wen is Joan Watson's half sister.
Joan was unaware she had a half sister, until Lin went to her and Sherlock Holmes for help. She initially claimed to be an ex-girlfriend of Mycroft Holmes, but it was revealed that she never knew him and was in fact Joan's half sister.