Song was once a member of the women's preparatory group 6mix, which is going to debut on 20 15. Because JYP quit after MissA five years later, it was highly anticipated by everyone. Members of this group also play heroines in got7 and Xuanmei MV. However, in 20 14, Lena, the founding member, left JYP Company, and the troupe had no hope of making its debut. Song Yinfei later followed Lena's footsteps and left JYP to participate in this year's talent show "Sixteen" with other members. After winning, they debuted as members of the Twice group at +00 on June 20th, 2008.

Song left for two reasons: he preferred acting.

During his internship, Song mainly studied rap. Later, she felt that singing didn't seem to be her hobby, and acting was her future, so she resolutely left the company and chose to return to China to become an actor.