"RedVelvet's sister" SM's new girl group's "debut theory" is Hot Topic in Korea. .
● SM Entertainment Teiment registered the trademark of “HappyCollie” on August 16, and it was discovered that Tei.
● There is also a debate about the naming sense, but considering the “impact” at the time of “SNSD (Girls' Generation)” and “f(x)” announcement, there is an opinion that HappyCollie is sufficiently possible.