A serf is a member of the lowest class, attached to the land owned by a lord and required to perform labor in return for certain legal or customary rights. You have to work the land for your master for a certain period of time or until you have paid off your debt. It is a form of slavery because you could never pay off your debt and work for your lord forever.
they didn't earn money. instead they provided labor for their lord in return for land and other accommodations
Whats serf
The homonym for "serf" is "surf."
Your question is not entirely correct in its premise; a serf is not a slave and does not have an owner. A serf is a subject of a land owner whom the serf would address as lord.
In a feudal system, a serf would remain a serf no matter how hard they were to work.
Saint Serf died in 583.
Saint Serf was born in 500.
Riddle answer: a serf board.
Peasant/serf
The noble executed the serf.
The plural of the word "serf" is "serfs."
I doubt that they thought about the serf one way or the other. The serf was to do the work and didn't require much thought from his master.
Feudal serf attached to the soil is an adscript.