45 years old Ada Choi (蔡少芬) shared group photo of 52 years old Monica Chan (陳法蓉), 47 years old Athena Chu (朱茵), 48 years old Catherine Hung (洪欣) and herself on Weibo on 30th December 2018. Everyone is wearing sunglasses except Ada and without any make-up as well. She left a message: “Honestly, I am full of confidence!” Monica forwarded the photo and called themselves “Hong Kong F4”. Looks like it is related to the comment by Ada’s husband, Max Zhang (張晉) about her poor Mandarin. The netizens asked who spoke the best Mandarin and some voted for Monica. Theirs fans also posted their message: “Looking forward to “Hong Kong F4″ in 2019 and participating in variety shows!”

Source: https://ol.mingpao.com/php/showbiz3.php?nodeid=1546253297899&subcate=latest&issue=20181231