Ghost's Domain

Moving between two worlds did cause Happy a certain degree of a headache.

But he did manage the problem of eating: while he ate on one side, the other side would be sleeping or be practicing his qi cultivation technique and body fortification in prison. 

Over the day, the sick Happy cannot be considered to have improved very quickly. Instead, the healthy Happy in prison became stronger by leaps and bounds. After all, he relied on the resources in a branch prison to train his body fortification and qi cultivation, which allowed both to level up at amazing paces. But after two days, even if he did not activate his qi realm, it was now astronomically difficult for ten Inaction Realm fighters to make his Indestructible Body increase by 0.01 when they attacked him. 

Even so, the results after one day were still shocking. Indestructible Body had reached the seventh realm, and his Tendon Changing Classic was now at the sixth realm.