On the February 27 airing of MBC's 'Radio Star,' Sandeul shared, "I didn't leave my house for a month during B1A4's contract renewal because I was having a hard time. When the renewal didn't go as I desired, I wondered, 'How did we end up like this?' I was having such a hard time. I didn't want to go outside or meet anyone."
Sandeul continued, "I was watching TV, and I suddenly teared up, wondering, 'What am I doing?' Later, I was contacted by CNU hyung and Gongchan and met with them, we encouraged one another."
He added, "My members are not the type to show their hardships. But at a fan meeting, we told our fans that we're sorry that all 5 members couldn't be together, and Gongchan cried. I've seen him tear up many times, but that was the first time I've seen him cry his eyes out and yelling 'ahhhh'."
In November 2018, B1A4 announced Baro and Jinyoung decided not to renew their contracts, and the boy group will be promoting as 3 members with CNU, Gongchan, and Sandeul for now.