Han Sen was going crazy, having to dig through the sand with his tongue for the job. Han Sen could withstand a lot, but Dream Beast's ability to read his mind was particularly annoying.
Han Sen thought of many different ways in which he might be able to protect his thoughts from the mind-reading ability, but nothing seemed to work.
Han Sen gave those methods a few tries each, risking punishment. Before long, though, he noticed that the whole mind-reading thing wasn't based on hearing his precise thoughts. The creature would get an idea of what Han Sen was thinking about, then guess the rest.
That made Han Sen feel a bit better. If Dream Beast could read the details of everything in Han Sen's brain, many secrets would be revealed.
Because of all this testing, however, Han Sen was punished many times. The length of time he was supposed to work with Dream Beast was extended from three months to thirteen months.