On 3 April 1937, Puyi's younger full brother Prince Pujie was proclaimed heir apparent after marrying Lady Hiro Saga, a distant cousin of the Japanese Emperor Hirohito. The Kwantung Army general Shigeru Honjō had politically arranged the marriage. Puyi thereafter would not speak candidly in front of his brother and refused to eat any food Lady Saga provided, believing she was out to poison him. Puyi was forced to sign an agreement that if he himself had a male heir, the child would be sent to Japan to be raised by the Japanese. Puyi initially thought Lady Saga was a Japanese spy, but came to trust her after the Sinophile Saga discarded her kimono for "cheongsams" and repeatedly assured him that she came to the Salt Tax Palace because she was Pujie's wife, not as a spy. Behr described Lady Saga as "intelligent" and "level-headed", and noted the irony of Puyi snubbing the one Japanese who really wanted to be his friend. Later in April 1937, the 16-year-old Manchu aristocrat Tan Yuling moved into the Salt Tax Palace to become Puyi's concubine, but though Puyi seems to have liked her, it remains unclear whether he had sex with her. Lady Saga tried to improve relations between Puyi and Wanrong by having them eat dinner together, which was the first time they had shared a meal in three years.