However, one must be cautious when accepting disciples. Once a mentor-disciple relationship is established, if the disciple gets expelled from the guild due to personal reasons, the mentor would lose that spot completely and each of those spots is incredibly precious.
Similarly, disciples need to be careful when choosing mentors. Once a mentor-disciple relationship is established, the disciple can't simply change mentors on their own. They could only end the relationship if the mentor gets kicked out of the guild due to personal reasons.
After terminating the relationship, with the high level of the disciple it would be challenging to find another high-level mentor who still had available spots. Although the disciple could still find another mentor, they would no longer be eligible for subsequent rewards.