On April 1 episode of SBS POWER FM's radio show 'Young Street', the members of WJSN joined the talk.

BONA said, "It's JISOO of BLACKPINK. We are similar in terms of how we keep in touch with each other."
She continued, "You know there are people who reply really fast. But there are also people who reply super slow. I'm the latter kind."
She resumed, "When JISOO and I text each other, we only exchange like one or two texts a day. JISOO is like me. We are alike that way."
BONA laughed and added, "Sometimes, we don't reply to each other for like two or three days."

BONA once mentioned that she wanted to be friends with JISOO, then JISOO said to have approached BONA first after knowing about that.
(Credit= SBS POWER FM Young Street, 'BONA' Weibo)
(SBS Star)