On the fifth episode of Mnet's survival program, 'MIX & MATCH,' there were many appearances by other big names of YG, such as Tablo, his daughter Haru, Lee Hi, Akdong Musician's Lee Soo Hyun, and trainee Jang Han Na.  The latter three were matched with the trainees for collaboration stages.

Despite being in the same agency, not everything was smooth sailing--at least not in B.I's team.  The team members B.I, Yang Hong Seok, and Kim Dong Hyuk were paired with Lee Hi.  First, B.I showed his intention to do a 'let's play' concept for a fun and exciting stage, but Lee Hi showed her dissatisfaction with his choice of "Let It Go" from 'Frozen,' causing some tension between the two.  B.I tried to persuade her, claiming that if they did this well, there would be a good result.  

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During vocal training with trainer Choi Won Suk, B.I Team received harsh criticism.  Choi Won Suk pointed out that Yang Hong Seok and Lee Hi did not match well, saying, "Your harmonies really do not match."

The students looked grave.  When Lee Hi personally demonstrated something, B.I said, "That's right, teach us those things."

However, Lee Hi showed she was upset.  She said, "I showed them this one hundred times.  I really worked hard, but it's not working, so I am really angry.  I don't know if it's cause they're doing it wrong even while knowing it's wrong, they really don't know, or they're not focusing on what they're doing."

You can watch bits of the three teams' vocal training in the clip above.