The preview starts out happily enough, with the members exchanging somewhat bizarre Christmas presents. The preview moves on to the members having an arm wrestling contest, and it looks like some members are just way stronger than the others! 

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However, the happiness takes a pause there - the members have a confession time about things they haven't been able to say before, such as some of the members being Chinese and having difficulties because of their nationality.

Apparently, the stories are enough to make some of the members tear up, so check out the teaser above.