It Is Difficult for Master and Disciple to Cultivate

Chaoxi had only accepted one apprentice in three thousand years. She thought that this apprentice might repay kindness with kindness or revenge with kindness, but she never thought that this disciple would fall in love with her. (Slow-heating type, the master treats the apprentice unconditionally in the early stage, but the apprentice eventually goes on a perverted path and wants to overwhelm the master)