On February 9, Segok Middle School in Gangnam, Seoul held its graduation ceremony. Among the graduating students was Seo Yeon, a.k.a TWICE Jihyo's youngest sister.�

SEE ALSO: Brian reveals the reason he is still single at 43

The whole family including the idol star attended the event together.�

It's reported the unexpected appearance of a popular girl group member made everyone overly excited and turned the day even more special for the graduating students.�Jihyo also took the time to take photos with her sister's friends and other fans.�

This year's�graduation will definitely be an unforgettable memory for students and families of Segok Middle School!�