f(x)'s Luna shows her close friendship with IU.

In the upcoming episode of MBC's 'Radio Star' on May 27th, Luna, Kahi, BTOB's Sungjae, Kim Hyung Suk will make their guest appearance and share their stories 'King of Mask Singer'.

To Luna, who has gained much attention after revealing her identity as the 'Gold Lacquer' on the show, Kim Gu Ra asked,"Who was the first one to contact you after that?", to this she answered,"IU was the first one to contact me".

She continued,"Even when my identity wasn't even revealed yet, she texted me,'Gold Lacquer Luna, your singing has been improved a lot?'".

In particular, Luna shared that Lee Soo Man also sent her a congratulatory message, which made Super Junior's Kyuhyun envy upon hearing it.

This episode of 'Radio Star' will go on air on May 27th at 11:15PM KST.