On April 13 episode of KBS Cool FM's radio show 'Music Plaza', IU was invited as a guest.

IU said, "In Na and I actually live in the same building; she lives right above me. So, we meet up pretty often. I usually go see her first."
She continued, "But when we meet up, we don't necessarily do things together. We mostly just do our own things in the same space."
She laughingly added, "I think we sort of think one another like each other's pet dog or something."

IU said, "It's really nice to have In Na living in the same building. We both live by ourselves, but our parents don't worry about us, because they know we have each other. Otherwise, they probably would worry."

First met while shooting SBS' television show 'Heroes' in 2010, the two stars have been maintaining their rock-solid friendship since then.
(Credit= '현대자동차(AboutHyundai)' YouTube, KBS Cool FM Music Plaza)
(SBS Star)