18 March 2019. Fans found that BLACKVELVET's Sooyun post on instagram to congrat for EVERGLOW (Yuehua Entertainment new girlgroup)

'Congratulation, for EVERGLOW. I can't wait to see your perfomance. Hope all BlaVel (fanBV) will support EVERGLOW for their debut. Bon Bon Chocolate are the best song i ever hear. And congratulation for my childhood friend EVERGLOW's Sihyeon for your debut. EVERGLOW! FIGHTING! HWAITING!'

And all Fans are really shook that EVERGLOW's  Sihyeon are BLACKVELVET's Sooyun childhood friend. And EVERGLOW are the third group who are Congratulation by BLACKVELVET.

Group that Congratulation by BLACKVELVET are Red Velvet, Nct and Everglow.

All Fans say that BLACKVELVET are the good sunbae for their SM rookies and Other agency rookies.

All Fans say that they will support EVERGLOW as much as they can.