Who moved Li Yutang's watch in bodyguards and assassins?

Upstairs, the man played by Nicholas Tse is called A Si. Li Yutang's pocket watch (he didn't have a watch) was bounced by his son, who drew lots to pretend to be Sun Yat-sen. He didn't want his son to take risks, so Shigemitsu came up with this trick. What a pity to die so tragically in the end! PS。 Music is with me, and Nicholas Tse is irreplaceable.