There is a new patches :
-From now on, all the new player's Youtube search character limit will be changed into 3 character.
You can buy the character limit +1 by using your in-game gold. You can earn gold by playing the casual
mode.
-I have changed the interface of purchasing the search character limit.
I changed 'Buy' into 'Buy with 10000G', so you can know how much it costs.
Update Patch Notes
Source: Steam Community (opens in a new tab)