Ha Ji-won's current age is the same as Moon Boon-hong's age when they filmed Secret Garden...

Source: Women's Generation oihb

Secret Garden (2010~2011) Ha Ji-won → 33~34 years old (Int'l age 32)

Secret Garden (2010~2011) Park Joon-geum → 48~49 years old (Int'l age 47)

Ha Ji-won currently in 2026 → 48 years old (Int'l age 47)

In the drama, they appeared as mother and daughter, but in reality, there is only about a 16-year difference.

Source: https://cafe.daum.net/subdued20club/ReHf/5660875