On the July 26 broadcast of KBS2's 'The Seasons - Zico's Artist', NCT 127 appeared as guests to promote their 6th full album, 'Walk'.

On this day, member Mark revealed that he wished to see MC Zico. The NCT 127 member stated, "I don't know if you remember, but my debut stage was on KBS2's 'Music Bank'. I honestly didn't even know what 'debuting' meant. But when I saw Block B performing on stage that day, I realized that I'd debuted."

Along with this remark, footage of NCT 127's debut interview on 'Music Bank' was shown, hitting the members with a wave of nostalgia. It also happened that Block B took part in an interview on the same 'Music Bank' broadcast that day, showing MC Zico during his idol days. 

Seeing the back to back interviews, MC Zico recalled, "That was when you debuted with 'The 7th Sense'. Because SM was releasing a new group after so long, everyone was paying attention. Block B also went to watch the rehearsal. I remember thinking you guys were such talented dancers, that I started questioning if I had grown lazy."

Here, member Jungwoo asked Zico, "During your Block B days, what was your group's greeting?". In response, Zico showed NCT 127 his group's official greeting, before adding on, "It's been so long since I did this greeting. I hope that I will have a chance to do this greeting again some time in the future." 

Also on this episode, NCT 127 invited Zico to do the "Walk Challenge" together. The group then performed their comeback title track "Walk", b-side track "Meaning of Love", as well as "Kick It + Fact Check". 

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