Yoona celebrated her 27th birthday on May 30 and her Chinese fans came out in full force on Weibo.
They sent over 850 million messages with the hashtag #ImYoona0530HappyBirthday, the 3rd most trending of the day.
Even with the tension between South Korea and China due to THAAD, Yoonas popularity is almost unrivaled.
Chinese netizens voted her as the top Korean female star and she has even become semi-fluent in Chinese!
She is even able to respond to interviewers questions without the assistance of a translator.