She hasn’t been in anything in a while, and her acting isn’t all that strong, but OOOOKAY. If I were to make a bet, I would say she is headed down the Jessica path, and will end ties with SM soon enough.
“We have discussed her future activities with Sulli who is currently taking a break with minimal activities. We have decided to respect her wishes and she will be officially leaving f(x) and focusing on her acting career. Following this f(x) will be going ahead as a four-member group with Victoria, Luna, Amber, and Krystal.
As f(x) is receiving much love for their unique music and each of them is becoming well-respected artists in their own rights. We plan to support f(x) and Sulli fully in their activities.”
As for f(x), I don’t know that this is a terrible loss since Sulli wasn’t a main singer or a rapper. It will thought their impeccable choreographies off though.