Sung Yu-ri posted two photos on his instagram on the 15th, along with an article entitled "Afternoon tea."
Meanwhile, Sung Yu-ri appeared with Fin.K.L members Ok Joo Hyun, Lee Jin and Lee Hyori in JTBC entertainment program 'Cam Fin.K.Lup' which last September.
About Fin.K.L
Fin.K.L is a South Korean girl group formed by DSP Media in 1998 consisting of members Lee Hyori, Ock Joo-hyun, Lee Jin, and Sung Yu-ri. Fin.K.L was one of the most popular K-pop groups of the late 1990s and early 2000s, alongside rival girl group S.E.S.
 Wikipedia