Han Sen brought Ji Yanran, Bao'er, and Zero with him on the spacecraft to visit Otto Planet. Otto Planet was one big holiday resort, and a single ticket was all it took for a visitor to enjoy the plethora of services available there.
Chasing respite, you could eat and play to your heart's content. After being given access to the planet, everything there was free. Aside from the caveat that you couldn't take anything home with you, as that would be theft.
Since only the most high-class citizens could typically afford a vacation planet, tickets were very expensive. Those who went there were the sorts with fat wallets and thick purses.
And for certain additional services, people were expected to open said currency holders to experience them.
Han Sen's ticket was all-inclusive, however. He would be able to enjoy every single service available at his own pleasure and disclosure. Nothing was off-limits for his visit.