After showing the world that she and Super Junior’s Heechul are close labelmates, f(x)’s Sulli followed up a few days later by uploading a picture of herself at “Kim Heechul’s Young Street” radio center with fellow group member Luna.

She posted the picture her me2day with the caption, “I became SulHee for our Hee-oppa.” She continued, “Hee-oppa must have been listened to the broadcast. He called us suddenly for emergency therapy. Thank you! Hee-brother is the best! Awesome day!”

Netizens wrote, “Sulli’s radio is so cute!“, “Strong SM line bond~<3″, and even compared the two’s bond to MC Yoo Jae Suk and Lee Hyori’s “National Family” title.