On March 9, SBS's brand new travel variety program 'No Math School Trip' introduced viewers to its eclectic bunch of cast members, including Lee Yong Jin, Yang Se Chan, Block B's Zico, EXO's D.O, Crush, and Jannabi's Choi Jung Hoon. 

First, before their exciting class trip to Hokkaido, Japan, the show's 1992-line members Zico, D.O, Crush, and Choi Jung Hoon met up to become acquainted with one another. However, Zico, D.O, and Crush were already fairly close friends, and immediately demonstrated a comfortable and casual chemistry as soon as they gathered. 

In particular, Zico revealed that he and Crush had known each other since middle school. "We used to share music on an online community for rookie musicians. And then we actually became friends for real around when we were 20-years old. By chance, we ran into each other at a restaurant after doing a show at a club," Zico explained. Crush then added on during his interview, "Now, [Zico] is one of my most precious friends. He is someone I can rely on."

As for his rather unexpected(?) close friendship with EXO's D.O., Zico stated, "We always had a lot of people that we both knew and had connections with. I think there was a point when our paths intersected through mutual acquaintances." D.O. further recalled, "I just felt comfortable with Jiho as soon as we met. We are very similar people, personality-wise. He is a friend I call up if I have nothing to do."

Next, regarding D.O. and Crush's progressing(?) friendship, Zico commented, "They know each other. But I'd say they can't curse in front of each other yet." On the other hand, D.O. and Crush revealed, "We met up a handful of times while preparing to sing the congratulatory song at Park Shin Hye and Choi Tae Joon's wedding," and "We haven't had that many chances to have deep conversations yet." 

Later on, while waiting for their fourth 1992-line member Choi Jung Hoon to arrive, Crush learned that Zico and D.O. shared the same MBTI personality type, both being "E" for extroverted. Crush, himself being "I" for introverted, succeeded in getting D.O. to sit next to him, so that the last empty seat remained next to Zico. 

Did you watch the first episode of SBS's 'No Math School Trip'?