Choi Hyun Suk shared his sibling's reaction to his impending debut.

On January 25, the final members of 'YG Treasure Box' went on Naver V Live. 

Choi Hyun Suk, who was the last member to join YG Entertainmet's new boy group, stated, "I thought I wouldn't make it but I woke up and checked in the morning and I was really mind blown. Everything just sparked."

He also shared his parents were very happy and his 15-year-old dongsaeng smiled at him for the first time in years. Choi Hyun Suk said, "My dongsaeng was like that after hitting puberty but finally smiled at me for the first time in 3-4 years." Choi Hyun Suk brought more laughter as he revealed his dongsaeng also asked him to get iKON's autograph.