Unsha (언샤) is Ivan's segyein guardian.[1] 

There was something in his eyes - something different - and he seemed like the most promising one.

Unsha, Guardian Interview: Pet humans trending! Raising them well pays off!

Unsha got Ivan as a birthday gift for his wife. He chose Ivan specifically because of the look in his eyes. Unsha also mentioned that he had just begun to venture into the pet human entertainment business, so the timing was perfect.[1]

According to Ivan, Unsha is well-known, and the two of them had more of a business relationship than a familial one.[2]

Round 6

When asked for his thoughts on Ivan's impulsive actions in Round 6, Unsha was disappointed that Ivan essentially forfeited the round, and he thought Ivan had a lot of potential. He also admitted to being curious about what Ivan was thinking.[1]

He went on to say that he felt he had learned a lot from being with Ivan, and that Ivan was worth the loss. He also did not intend to participate in the competition in the future.[1]