In One Piece cartoon 594, Luffy and his party read the newspaper and understood what it meant. They saw it and said, Luffy, I'm coming?

It is reported in the newspaper that Luffy has returned to the naval base, that he has rung the bell of 16, and published his photo.

The tattoo on Luffy's arm in the photo indicates the agreement after three days, and the X on the three characters indicates the cancellation of the agreement after three days.

Every year in Naval Headquarters, there is a ceremony to ring the bell for 8 times. Lufei rings the bell 16, which means two years.

The general meaning is to terminate the contract after 3 days and change it to two years later.