On November 18, 2015, it was reported that Fung had disappeared. Guotai Junan International's shares had fallen as much as 17% when it first announced about Yim's disappearance and it had appointed a temporary replacement.
Return
Guotai Junan International issued a statement saying Yim had returned after assisting in certain investigations and "neither Yim nor the company were the subject of the investigation". Yim had resumed his duties thereafter. The mysterious nature of Yim's disappearance coincided with a period when the government was focusing on the financialsector in its anti-corruption crackdown.