 Sun then introduced them to Chan Siu-bak, his classmate at the Hong Kong College of Medicine for Chinese.The four frequently met at Yeung Yiu Kee to discuss a revolution against the Qing Dynasty, and were collectively called the Four Bandits by their neighbours.When Sun graduated in 1892, he had to borrow money from Hospital Kiang Wu to set up his own pharmacy in Macao, and Yeung persuaded his brother-in-law, Ng Tsit-mei (吳節薇), to be Sun's guarantor.